bitbake: fetch2/git.py: Add missing "errno" module import.

This goes undetected most of the time, but when updating a repository,
if the ud.fullmirror file is not present, you end up getting an
exception instead of carrying on because the errno module is not
loaded (specifically "if exc.errno != errno.ENOENT").

(Bitbake rev: e6fca8480731ce817df9bee61438347a5e3d3017)

Signed-off-by: Kristian Amlie <kristian.amlie@mender.io>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/git.py

@@ -70,6 +70,7 @@ import errno
 import os
 import re
 import bb
+import errno
 from   bb    import data
 from   bb.fetch2 import FetchMethod
 from   bb.fetch2 import runfetchcmd