meta-openembedded and poky: subtree updates

Squash of the following due to dependencies among them
and OpenBMC changes:

meta-openembedded: subtree update:d0748372d2..9201611135
meta-openembedded: subtree update:9201611135..17fd382f34
poky: subtree update:9052e5b32a..2e11d97b6c
poky: subtree update:2e11d97b6c..a8544811d7

The change log was too large for the jenkins plugin
to handle therefore it has been removed. Here is
the first and last commit of each subtree:

meta-openembedded:d0748372d2
      cppzmq: bump to version 4.6.0
meta-openembedded:17fd382f34
      mpv: Remove X11 dependency
poky:9052e5b32a
      package_ipk: Remove pointless comment to trigger rebuild
poky:a8544811d7
      pbzip2: Fix license warning

Change-Id: If0fc6c37629642ee207a4ca2f7aa501a2c673cd6
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/poky/bitbake/lib/bb/persist_data.py b/poky/bitbake/lib/bb/persist_data.py
index de8f87a..7357ab2 100644
--- a/poky/bitbake/lib/bb/persist_data.py
+++ b/poky/bitbake/lib/bb/persist_data.py
@@ -179,6 +179,9 @@
         elif not isinstance(value, str):
             raise TypeError('Only string values are supported')
 
+        # Ensure the entire transaction (including SELECT) executes under write lock
+        cursor.execute("BEGIN EXCLUSIVE")
+
         cursor.execute("SELECT * from %s where key=?;" % self.table, [key])
         row = cursor.fetchone()
         if row is not None: