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/meta-openembedded/meta-oe/recipes-support/cpprest/cpprest/950-fix.patch b/meta-openembedded/meta-oe/recipes-support/cpprest/cpprest/950-fix.patch
new file mode 100644
index 0000000..3ae46a1
--- /dev/null
+++ b/meta-openembedded/meta-oe/recipes-support/cpprest/cpprest/950-fix.patch
@@ -0,0 +1,26 @@
+Origin: upstream
+Bug: https://github.com/Microsoft/cpprestsdk/issues/950
+Last-Update: 2018-11-04
+
+Index: cpprest/Release/src/utilities/asyncrt_utils.cpp
+===================================================================
+--- cpprest.orig/Release/src/utilities/asyncrt_utils.cpp
++++ cpprest/Release/src/utilities/asyncrt_utils.cpp
+@@ -356,7 +356,7 @@
+ inline size_t count_utf8_to_utf16(const std::string& s)
+ {
+     const size_t sSize = s.size();
+-    auto sData = reinterpret_cast<const UtilCharInternal_t* const>(s.data());
++    auto const sData = reinterpret_cast<const UtilCharInternal_t*>(s.data());
+     size_t result{ sSize };
+ 
+     for (size_t index = 0; index < sSize;)
+@@ -441,7 +441,7 @@
+ {
+     // Save repeated heap allocations, use the length of resulting sequence.
+     const size_t srcSize = s.size();
+-    auto srcData = reinterpret_cast<const UtilCharInternal_t* const>(s.data());
++    auto const srcData = reinterpret_cast<const UtilCharInternal_t*>(s.data());
+     utf16string dest(count_utf8_to_utf16(s), L'\0');
+     utf16string::value_type* const destData = &dest[0];
+     size_t destIndex = 0;