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/meta/recipes-graphics/mesa/files/0004-Use-Python-3-to-execute-the-scripts.patch b/poky/meta/recipes-graphics/mesa/files/0004-Use-Python-3-to-execute-the-scripts.patch
new file mode 100644
index 0000000..8953c4a
--- /dev/null
+++ b/poky/meta/recipes-graphics/mesa/files/0004-Use-Python-3-to-execute-the-scripts.patch
@@ -0,0 +1,32 @@
+From ebe6077a1d74e56b28249f71e8760295fa846ed2 Mon Sep 17 00:00:00 2001
+From: Otavio Salvador <otavio@ossystems.com.br>
+Date: Fri, 29 Dec 2017 10:27:59 -0200
+Subject: [PATCH 4/6] Use Python 3 to execute the scripts
+Organization: O.S. Systems Software LTDA.
+
+The MESA build system uses Python 2 but as OE-Core has moved away from
+it, we change it to use Python 3 instead.
+
+Upstream-Status: Inappropriate [ configuration ]
+
+Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index dd172f1ebe..40cac36ac2 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -122,7 +122,7 @@ AM_PROG_CC_C_O
+ AC_PROG_NM
+ AM_PROG_AS
+ AX_CHECK_GNU_MAKE
+-AC_CHECK_PROGS([PYTHON2], [python2.7 python2 python])
++AC_CHECK_PROGS([PYTHON2], [python3.5 python3 python])
+ AC_PROG_SED
+ AC_PROG_MKDIR_P
+ 
+-- 
+2.18.0
+