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-python/recipes-devtools/python/python-pyyaml.inc b/meta-openembedded/meta-python/recipes-devtools/python/python-pyyaml.inc
index 3fef0ca..afce543 100644
--- a/meta-openembedded/meta-python/recipes-devtools/python/python-pyyaml.inc
+++ b/meta-openembedded/meta-python/recipes-devtools/python/python-pyyaml.inc
@@ -2,14 +2,14 @@
 HOMEPAGE = "http://www.pyyaml.org"
 SECTION = "devel/python"
 LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=6015f088759b10e0bc2bf64898d4ae17"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=5591701d32590f9fa94f3bfee820b634"
 DEPENDS = "libyaml ${PYTHON_PN}-cython-native ${PYTHON_PN}"
 
 PYPI_PACKAGE = "PyYAML"
 inherit pypi
 
-SRC_URI[md5sum] = "4c129761b661d181ebf7ff4eb2d79950"
-SRC_URI[sha256sum] = "592766c6303207a20efc445587778322d7f73b161bd994f227adaa341ba212ab"
+SRC_URI[md5sum] = "b78b96636d68ac581c0e2f38158c224f"
+SRC_URI[sha256sum] = "3ef3092145e9b70e3ddd2c7ad59bdd0252a94dfe3949721633e41344de00a6bf"
 
 RDEPENDS_${PN} += "\
     ${PYTHON_PN}-datetime \