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-tasks.xml b/poky/documentation/ref-manual/ref-tasks.xml
index e6cf686..8f3ff26 100644
--- a/poky/documentation/ref-manual/ref-tasks.xml
+++ b/poky/documentation/ref-manual/ref-tasks.xml
@@ -596,15 +596,6 @@
         </para>
     </section>
 
-    <section id='ref-tasks-rm_work_all'>
-        <title><filename>do_rm_work_all</filename></title>
-
-        <para>
-            Top-level task for removing work files after the build system has
-            finished with them.
-        </para>
-    </section>
-
     <section id='ref-tasks-unpack'>
         <title><filename>do_unpack</filename></title>
 
@@ -895,7 +886,7 @@
             Boots an image and performs runtime tests within the image
             immediately after it has been built.
             This task is enabled when you set
-            <link linkend='var-TEST_IMAGE'><filename>TEST_IMAGE</filename></link>
+            <link linkend='var-TESTIMAGE_AUTO'><filename>TESTIMAGE_AUTO</filename></link>
             equal to "1".
         </para>