reset upstream subtrees to yocto 2.6

Reset the following subtrees on thud HEAD:

  poky: 87e3a9739d
  meta-openembedded: 6094ae18c8
  meta-security: 31dc4e7532
  meta-raspberrypi: a48743dc36
  meta-xilinx: c42016e2e6

Also re-apply backports that didn't make it into thud:
  poky:
    17726d0 systemd-systemctl-native: handle Install wildcards

  meta-openembedded:
    4321a5d libtinyxml2: update to 7.0.1
    042f0a3 libcereal: Add native and nativesdk classes
    e23284f libcereal: Allow empty package
    030e8d4 rsyslog: curl-less build with fmhttp PACKAGECONFIG
    179a1b9 gtest: update to 1.8.1

Squashed OpenBMC subtree compatibility updates:
  meta-aspeed:
    Brad Bishop (1):
          aspeed: add yocto 2.6 compatibility

  meta-ibm:
    Brad Bishop (1):
          ibm: prepare for yocto 2.6

  meta-ingrasys:
    Brad Bishop (1):
          ingrasys: set layer compatibility to yocto 2.6

  meta-openpower:
    Brad Bishop (1):
          openpower: set layer compatibility to yocto 2.6

  meta-phosphor:
    Brad Bishop (3):
          phosphor: set layer compatibility to thud
          phosphor: libgpg-error: drop patches
          phosphor: react to fitimage artifact rename

    Ed Tanous (4):
          Dropbear: upgrade options for latest upgrade
          yocto2.6: update openssl options
          busybox: remove upstream watchdog patch
          systemd: Rebase CONFIG_CGROUP_BPF patch

Change-Id: I7b1fe71cca880d0372a82d94b5fd785323e3a9e7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/poky/documentation/ref-manual/ref-system-requirements.xml b/poky/documentation/ref-manual/ref-system-requirements.xml
index aea1fdf..69d4b4e 100644
--- a/poky/documentation/ref-manual/ref-system-requirements.xml
+++ b/poky/documentation/ref-manual/ref-system-requirements.xml
@@ -66,6 +66,14 @@
                         below.
                         </para></listitem>
                     <listitem><para>
+                        The Yocto Project is not compatible with the
+                        <ulink url='https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux'>Windows Subsystem for Linux</ulink>
+                        (WSL).
+                        You cannot use a
+                        <link linkend='hardware-build-system-term'>build host</link>
+                        that is running WSL.
+                        </para></listitem>
+                    <listitem><para>
                         If you encounter problems, please go to
                         <ulink url='&YOCTO_BUGZILLA_URL;'>Yocto Project Bugzilla</ulink>
                         and submit a bug.
@@ -80,46 +88,49 @@
                 </itemizedlist>
             </note>
             <itemizedlist>
-<!--
-                <listitem><para>Ubuntu 10.04</para></listitem>
+<!--            <listitem><para>Ubuntu 10.04</para></listitem>
                 <listitem><para>Ubuntu 11.10</para></listitem>
                 <listitem><para>Ubuntu 12.04 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 13.10</para></listitem>
-                <listitem><para>Ubuntu 14.04 (LTS)</para></listitem> -->
+                <listitem><para>Ubuntu 14.04 (LTS)</para></listitem>
                 <listitem><para>Ubuntu 14.10</para></listitem>
                 <listitem><para>Ubuntu 15.04</para></listitem>
-                <listitem><para>Ubuntu 15.10</para></listitem>
+                <listitem><para>Ubuntu 15.10</para></listitem> -->
                 <listitem><para>Ubuntu 16.04 (LTS)</para></listitem>
-<!--                <listitem><para>Fedora 16 (Verne)</para></listitem>
+                <listitem><para>Ubuntu 16.10 (LTS)</para></listitem>
+                <listitem><para>Ubuntu 17.04</para></listitem>
+<!--            <listitem><para>Fedora 16 (Verne)</para></listitem>
                 <listitem><para>Fedora 17 (Spherical)</para></listitem>
-                <listitem><para>Fedora release 19 (Schrödinger's Cat)</para></listitem>
-                <listitem><para>Fedora release 20 (Heisenbug)</para></listitem> -->
+                <listitem><para>Fedora 19 (Schrödinger's Cat)</para></listitem>
+                <listitem><para>Fedora release 20 (Heisenbug)</para></listitem>
                 <listitem><para>Fedora release 22</para></listitem>
                 <listitem><para>Fedora release 23</para></listitem>
-<!--                <listitem><para>Fedora release 24</para></listitem>
-                <listitem><para>CentOS release 5.6 (Final)</para></listitem>
+                <listitem><para>Fedora release 24</para></listitem> -->
+                <listitem><para>Fedora release 26</para></listitem>
+<!--            <listitem><para>CentOS release 5.6 (Final)</para></listitem>
                 <listitem><para>CentOS release 5.7 (Final)</para></listitem>
                 <listitem><para>CentOS release 5.8 (Final)</para></listitem>
                 <listitem><para>CentOS release 6.3 (Final)</para></listitem>
                 <listitem><para>CentOS release 6.x</para></listitem> -->
                 <listitem><para>CentOS release 7.x</para></listitem>
-<!--                <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem>
+<!--            <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.x (Wheezy)</para></listitem> -->
                 <listitem><para>Debian GNU/Linux 8.x (Jessie)</para></listitem>
                 <listitem><para>Debian GNU/Linux 9.x (Stretch)</para></listitem>
-<!--                <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
+<!--            <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.2 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.3 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.4 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.5 (Wheezy)</para></listitem>
-                <listitem><para>Debian GNU/Linux 7.6 (Wheezy)</para></listitem> -->
-<!--                <listitem><para>openSUSE 11.4</para></listitem>
+                <listitem><para>Debian GNU/Linux 7.6 (Wheezy)</para></listitem>
+                <listitem><para>openSUSE 11.4</para></listitem>
                 <listitem><para>openSUSE 12.1</para></listitem>
                 <listitem><para>openSUSE 12.2</para></listitem>
                 <listitem><para>openSUSE 12.3</para></listitem>
-                <listitem><para>openSUSE 13.1</para></listitem> -->
-                <listitem><para>openSUSE 13.2</para></listitem>
+                <listitem><para>openSUSE 13.1</para></listitem>
+                <listitem><para>openSUSE 13.2</para></listitem> -->
                 <listitem><para>openSUSE 42.1</para></listitem>
+                <listitem><para>openSUSE 42.2</para></listitem>
             </itemizedlist>
         </para>
 
@@ -132,8 +143,8 @@
         </note>
     </section>
 
-    <section id='required-packages-for-the-host-development-system'>
-    <title>Required Packages for the Host Development System</title>
+    <section id='required-packages-for-the-build-host'>
+    <title>Required Packages for the Build Host</title>
 
         <para>
             The list of packages you need on the host development system can