oe.utils: add bb, bb.data imports

While the metadata can and should rely on bb always being available, this
needn't necessarily be the case for imported python modules.

(From OE-Core rev: a521835701c07f5786acd663fb4fb394e93eba91)

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

meta/lib/oe/utils.py

@@ -1,3 +1,5 @@
+import bb, bb.data
+
 def read_file(filename):
     try:
         f = file( filename, "r" )