FetchInfo.commit breaks if you fetch a tag to anywhere but refs/tags/ #24
Description
As an example, use a refspec of refs/*:refs/remotes/origin/*. Behavior:
File "/home/kergoth/.local/lib/python2.6/site-packages/git/refs/tag.py", line 26, in commit
obj = self.object
File "/home/kergoth/.local/lib/python2.6/site-packages/git/refs/symbolic.py", line 158, in _get_object
return Object.new_from_sha(self.repo, hex_to_bin(self.dereference_recursive(self.repo, self.path)))
File "/home/kergoth/.local/lib/python2.6/site-packages/git/refs/symbolic.py", line 112, in dereference_recursive
hexsha, ref_path = cls._get_ref_info(repo, ref_path)
File "/home/kergoth/.local/lib/python2.6/site-packages/git/refs/symbolic.py", line 139, in _get_ref_info
raise ValueError("Reference at %r does not exist" % ref_path)
ValueError: Reference at 'refs/tags/766da90/tags/1.0' does not exist
I'd guess there's an implicit assumption that a tag lives in refs/tags/, and the ref path is reconstructed based on that rather than using the correct ref path which the code has already (refs/remotes/766da90/tags/1.0).