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/classes/kernel_wireless_regdb.bbclass b/meta-openembedded/meta-networking/classes/kernel_wireless_regdb.bbclass
new file mode 100644
index 0000000..1238172
--- /dev/null
+++ b/meta-openembedded/meta-networking/classes/kernel_wireless_regdb.bbclass
@@ -0,0 +1,20 @@
+# Linux kernels before v4.15, allowed to be compiled with static
+# regulatory database if it was put under net/wireless/db.txt.
+#
+# This class copies the regulatory plaintext database to kernel sources before
+# compiling.
+#
+# Usage:
+# 1. The class should be inherited by kernel recipe (e.g. in
+#    linux-yocto_%.bbappend).
+# 2. For Linux kernels up to v4.14, build kernel with CONFIG_EXPERT and
+#    CONFIG_CFG80211_INTERNAL_REGDB.
+
+DEPENDS += "wireless-regdb-native"
+
+SRCTREECOVEREDTASKS += "do_kernel_add_regdb"
+do_kernel_add_regdb() {
+    cp ${STAGING_LIBDIR_NATIVE}/crda/db.txt ${S}/net/wireless/db.txt
+}
+do_kernel_add_regdb[dirs] = "${S}"
+addtask kernel_add_regdb before do_build after do_configure