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/lib/oeqa/selftest/cases/runqemu.py b/poky/meta/lib/oeqa/selftest/cases/runqemu.py
index a758aaf..4e35bb9 100644
--- a/poky/meta/lib/oeqa/selftest/cases/runqemu.py
+++ b/poky/meta/lib/oeqa/selftest/cases/runqemu.py
@@ -14,8 +14,6 @@
 
     image_is_ready = False
     deploy_dir_image = ''
-    # We only want to print runqemu stdout/stderr if there is a test case failure
-    buffer = True
 
     def setUpLocal(self):
         super(RunqemuTests, self).setUpLocal()
@@ -176,14 +174,17 @@
         # when qemu was shutdown by the above shutdown command
         qemu.runner.stop_thread()
         time_track = 0
-        while True:
-            is_alive = qemu.check()
-            if not is_alive:
-                return True
-            if time_track > timeout:
-                return False
-            time.sleep(1)
-            time_track += 1
+        try:
+            while True:
+                is_alive = qemu.check()
+                if not is_alive:
+                    return True
+                if time_track > timeout:
+                    return False
+                time.sleep(1)
+                time_track += 1
+        except SystemExit:
+            return True
 
     def test_qemu_can_shutdown(self):
         self.assertExists(self.qemuboot_conf)