persist_data: add has_key

(Bitbake rev: 7942833ca0685cf4f3b243dde6203499ef97420c)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/persist_data.py

@@ -110,6 +110,9 @@ class SQLTable(collections.MutableMapping):
         for row in data:
             yield row[0]
 
+    def has_key(self, key):
+        return key in self
+
 
 class SQLData(object):
     """Object representing the persistent data"""