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/meta-openembedded/meta-networking/recipes-protocols/net-snmp/net-snmp/net-snmp-5.7.2-fix-engineBoots-value-on-SIGHUP.patch b/meta-openembedded/meta-networking/recipes-protocols/net-snmp/net-snmp/net-snmp-5.7.2-fix-engineBoots-value-on-SIGHUP.patch
index fbd274b..5cbb60d 100644
--- a/meta-openembedded/meta-networking/recipes-protocols/net-snmp/net-snmp/net-snmp-5.7.2-fix-engineBoots-value-on-SIGHUP.patch
+++ b/meta-openembedded/meta-networking/recipes-protocols/net-snmp/net-snmp/net-snmp-5.7.2-fix-engineBoots-value-on-SIGHUP.patch
@@ -1,4 +1,4 @@
-From e47c60dc7f649959f63e56bc62355de4bdfd73f4 Mon Sep 17 00:00:00 2001
+From d619cd9fc01f336ff0ff55b18f9112789eb4d84c Mon Sep 17 00:00:00 2001
 From: Marian Florea <marian.florea@windriver.com>
 Date: Thu, 20 Jul 2017 16:55:24 +0800
 Subject: [PATCH] net snmp: fix engineBoots value on SIGHUP
@@ -7,16 +7,17 @@
 
 Signed-off-by: Marian Florea <marian.florea@windriver.com>
 Signed-off-by: Li Zhou <li.zhou@windriver.com>
+
 ---
  agent/snmpd.c    | 1 +
  snmplib/snmpv3.c | 4 ++--
  2 files changed, 3 insertions(+), 2 deletions(-)
 
-Index: net-snmp-5.7.3/agent/snmpd.c
-===================================================================
---- net-snmp-5.7.3.orig/agent/snmpd.c
-+++ net-snmp-5.7.3/agent/snmpd.c
-@@ -1253,6 +1253,7 @@ receive(void)
+diff --git a/agent/snmpd.c b/agent/snmpd.c
+index 6566354..eb0d4b4 100644
+--- a/agent/snmpd.c
++++ b/agent/snmpd.c
+@@ -1239,6 +1239,7 @@ receive(void)
  	    snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
  		     netsnmp_get_version());
              update_config();
@@ -24,11 +25,11 @@
              send_easy_trap(SNMP_TRAP_ENTERPRISESPECIFIC, 3);
  #if HAVE_SIGHOLD
              sigrelse(SIGHUP);
-Index: net-snmp-5.7.3/snmplib/snmpv3.c
-===================================================================
---- net-snmp-5.7.3.orig/snmplib/snmpv3.c
-+++ net-snmp-5.7.3/snmplib/snmpv3.c
-@@ -984,9 +984,9 @@ init_snmpv3_post_config(int majorid, int
+diff --git a/snmplib/snmpv3.c b/snmplib/snmpv3.c
+index 771ba3b..5de05e7 100644
+--- a/snmplib/snmpv3.c
++++ b/snmplib/snmpv3.c
+@@ -1060,9 +1060,9 @@ init_snmpv3_post_config(int majorid, int minorid, void *serverarg,
      /*
       * if our engineID has changed at all, the boots record must be set to 1 
       */