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-extended/mc/mc_4.8.20.bb b/poky/meta/recipes-extended/mc/mc_4.8.21.bb
similarity index 93%
rename from poky/meta/recipes-extended/mc/mc_4.8.20.bb
rename to poky/meta/recipes-extended/mc/mc_4.8.21.bb
index 70d1b5e..c6a4500 100644
--- a/poky/meta/recipes-extended/mc/mc_4.8.20.bb
+++ b/poky/meta/recipes-extended/mc/mc_4.8.21.bb
@@ -9,8 +9,8 @@
 SRC_URI = "http://www.midnight-commander.org/downloads/${BPN}-${PV}.tar.bz2 \
            file://0001-mc-replace-perl-w-with-use-warnings.patch \
            "
-SRC_URI[md5sum] = "dcfc7aa613c62291a0f71f6b698d8267"
-SRC_URI[sha256sum] = "2d85daaa6ab26e524946df4823ac2f69802bc16bc967781b5e28d5b86fc3b979"
+SRC_URI[md5sum] = "63d2b90e2198ee79d08eb4a8989220e2"
+SRC_URI[sha256sum] = "251d9f0ef9309ef3eea0fdc4c12b8b61149e5056bef1b2de2ccc7f015d973444"
 
 inherit autotools gettext pkgconfig