oeqa.utils.git: use --verify in rev_parse()

We use rev-parse for turning git object names into SHA-1 and checking
their existence. Using --verify option makes sure git-rev-parse does
what we expect.

(From OE-Core rev: f5b420c7f07a008c11d492b055c7cc8869f644d3)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/git.py

@@ -64,7 +64,7 @@ class GitRepo(object):
     def rev_parse(self, revision):
         """Do git rev-parse"""
         try:
-            return self.run_cmd(['rev-parse', revision])
+            return self.run_cmd(['rev-parse', '--verify', revision])
         except GitError:
             # Revision does not exist
             return None