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/bitbake/lib/layerindexlib/plugin.py b/poky/bitbake/lib/layerindexlib/plugin.py
new file mode 100644
index 0000000..92a2e97
--- /dev/null
+++ b/poky/bitbake/lib/layerindexlib/plugin.py
@@ -0,0 +1,60 @@
+# Copyright (C) 2016-2018 Wind River Systems, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+# The file contains:
+#   LayerIndex exceptions
+#   Plugin base class
+#   Utility Functions for working on layerindex data
+
+import argparse
+import logging
+import os
+import bb.msg
+
+logger = logging.getLogger('BitBake.layerindexlib.plugin')
+
+class LayerIndexPluginException(Exception):
+    """LayerIndex Generic Exception"""
+    def __init__(self, message):
+         self.msg = message
+         Exception.__init__(self, message)
+
+    def __str__(self):
+         return self.msg
+
+class LayerIndexPluginUrlError(LayerIndexPluginException):
+    """Exception raised when a plugin does not support a given URL type"""
+    def __init__(self, plugin, url):
+        msg = "%s does not support %s:" % (plugin, url)
+        self.plugin = plugin
+        self.url = url
+        LayerIndexPluginException.__init__(self, msg)
+
+class IndexPlugin():
+    def __init__(self):
+        self.type = None
+
+    def init(self, layerindex):
+        self.layerindex = layerindex
+
+    def plugin_type(self):
+        return self.type
+
+    def load_index(self, uri):
+        raise NotImplementedError('load_index is not implemented')
+
+    def store_index(self, uri, index):
+        raise NotImplementedError('store_index is not implemented')
+