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-gnome/README b/meta-openembedded/meta-gnome/README
index 2a682e7..84d4f73 100644
--- a/meta-openembedded/meta-gnome/README
+++ b/meta-openembedded/meta-gnome/README
@@ -23,16 +23,16 @@
 This layer depends on:
 
 URI: git://github.com/openembedded/oe-core.git
-branch: master
+branch: thud
 revision: HEAD
 
 URI: git://github.com/openembedded/meta-oe.git
-branch: master
+branch: thud
 revision: HEAD
 
-Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-gnome]' in the subject'
+Send pull requests to openembedded-devel@lists.openembedded.org with '[meta-gnome][thud]' in the subject'
 
 When sending single patches, please using something like:
-'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-gnome][PATCH'
+'git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix=meta-gnome][thud][PATCH'
 
-Layer maintainer: Andreas Müller <schnitzeltony@googlemail.com>
+Thud maintainer: Armin Kuster <akuster808@gmail.com>