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-lxml.inc b/meta-openembedded/meta-python/recipes-devtools/python/python-lxml.inc
index 3f3a1e2..7f355a7 100644
--- a/meta-openembedded/meta-python/recipes-devtools/python/python-lxml.inc
+++ b/meta-openembedded/meta-python/recipes-devtools/python/python-lxml.inc
@@ -18,8 +18,8 @@
 
 DEPENDS += "libxml2 libxslt"
 
-SRC_URI[md5sum] = "c266d9062e23b08f66426979a2b36f51"
-SRC_URI[sha256sum] = "e2629cdbcad82b83922a3488937632a4983ecc0fed3e5cfbf430d069382eeb9b"
+SRC_URI[md5sum] = "31239400ca4e130b69993bb3c14204b3"
+SRC_URI[sha256sum] = "e2afbe403090f5893e254958d02875e0732975e73c4c0cdd33c1f009a61963ca"
 
 DISTUTILS_BUILD_ARGS += " \
                      --with-xslt-config='pkg-config libxslt' \