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/documentation/poky.ent b/poky/documentation/poky.ent
index 1b71b80..c76fe7b 100644
--- a/poky/documentation/poky.ent
+++ b/poky/documentation/poky.ent
@@ -1,17 +1,17 @@
-<!ENTITY DISTRO "2.5.2">
-<!ENTITY DISTRO_COMPRESSED "252">
-<!ENTITY DISTRO_NAME_NO_CAP "sumo">
-<!ENTITY DISTRO_NAME "Sumo">
-<!ENTITY DISTRO_NAME_NO_CAP_MINUS_ONE "rocko">
-<!ENTITY DISTRO_NAME_MINUS_ONE "Rocko">
-<!ENTITY YOCTO_DOC_VERSION "2.5.2">
-<!ENTITY YOCTO_DOC_VERSION_MINUS_ONE "2.4.4">
-<!ENTITY DISTRO_REL_TAG "yocto-2.5.2">
-<!ENTITY METAINTELVERSION "9.2">
+<!ENTITY DISTRO "2.6.1">
+<!ENTITY DISTRO_COMPRESSED "261">
+<!ENTITY DISTRO_NAME_NO_CAP "thud">
+<!ENTITY DISTRO_NAME "Thud">
+<!ENTITY DISTRO_NAME_NO_CAP_MINUS_ONE "sumo">
+<!ENTITY DISTRO_NAME_MINUS_ONE "Sumo">
+<!ENTITY YOCTO_DOC_VERSION "2.6.1">
+<!ENTITY YOCTO_DOC_VERSION_MINUS_ONE "2.5.2">
+<!ENTITY DISTRO_REL_TAG "yocto-2.6.1">
+<!ENTITY METAINTELVERSION "9.0">
 <!ENTITY REL_MONTH_YEAR "December 2018">
 <!ENTITY META_INTEL_REL_TAG "&METAINTELVERSION;-&DISTRO_NAME_NO_CAP;-&YOCTO_DOC_VERSION;">
-<!ENTITY POKYVERSION "20.0.2">
-<!ENTITY POKYVERSION_COMPRESSED "2002">
+<!ENTITY POKYVERSION "21.0.1">
+<!ENTITY POKYVERSION_COMPRESSED "2101">
 <!ENTITY YOCTO_POKY "poky-&DISTRO_NAME_NO_CAP;-&POKYVERSION;">
 <!ENTITY COPYRIGHT_YEAR "2010-2019">
 <!ENTITY YOCTO_DL_URL "http://downloads.yoctoproject.org">