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/scripts/lib/devtool/build.py b/poky/scripts/lib/devtool/build.py
index 252379e..ba9593f 100644
--- a/poky/scripts/lib/devtool/build.py
+++ b/poky/scripts/lib/devtool/build.py
@@ -54,7 +54,11 @@
     """Entry point for the devtool 'build' subcommand"""
     workspacepn = check_workspace_recipe(workspace, args.recipename, bbclassextend=True)
 
-    build_tasks = _get_build_tasks(config)
+    if args.clean:
+        # use clean instead of cleansstate to avoid messing things up in eSDK
+        build_tasks = ['do_clean']
+    else:
+        build_tasks = _get_build_tasks(config)
 
     bbappend = workspace[workspacepn]['bbappend']
     if args.disable_parallel_make:
@@ -83,4 +87,5 @@
                                          group='working', order=50)
     parser_build.add_argument('recipename', help='Recipe to build')
     parser_build.add_argument('-s', '--disable-parallel-make', action="store_true", help='Disable make parallelism')
+    parser_build.add_argument('-c', '--clean', action='store_true', help='clean up recipe building results')
     parser_build.set_defaults(func=build)