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/classes/image-postinst-intercepts.bbclass b/poky/meta/classes/image-postinst-intercepts.bbclass
new file mode 100644
index 0000000..ed30bbd
--- /dev/null
+++ b/poky/meta/classes/image-postinst-intercepts.bbclass
@@ -0,0 +1,23 @@
+# Gather existing and candidate postinst intercepts from BBPATH
+POSTINST_INTERCEPTS_DIR ?= "${COREBASE}/scripts/postinst-intercepts"
+POSTINST_INTERCEPTS_PATHS ?= "${@':'.join('%s/postinst-intercepts' % p for p in '${BBPATH}'.split(':'))}:${POSTINST_INTERCEPTS_DIR}"
+
+python find_intercepts() {
+    intercepts = {}
+    search_paths = []
+    paths = d.getVar('POSTINST_INTERCEPTS_PATHS').split(':')
+    overrides = (':' + d.getVar('FILESOVERRIDES')).split(':') + ['']
+    search_paths = [os.path.join(p, op) for p in paths for op in overrides]
+    searched = oe.path.which_wild('*', ':'.join(search_paths), candidates=True)
+    files, chksums = [], []
+    for pathname, candidates in searched:
+        if os.path.isfile(pathname):
+            files.append(pathname)
+            chksums.append('%s:True' % pathname)
+            chksums.extend('%s:False' % c for c in candidates[:-1])
+
+    d.setVar('POSTINST_INTERCEPT_CHECKSUMS', ' '.join(chksums))
+    d.setVar('POSTINST_INTERCEPTS', ' '.join(files))
+}
+find_intercepts[eventmask] += "bb.event.RecipePreFinalise"
+addhandler find_intercepts