If a workspace is initialised with:
repo init -u git://path/to/manifest -b manifest-branch
and the default.xml specifies the default revision as `other-branch`,
running `repo info -d` results in a GitError:
fatal: bad revision 'refs/remotes/m/other-branch..'
The repo info command uses the default revision to build the symlink
to the remote revision which is passed to the `git rev-list` command.
This is incorrect; the manifest's branch name should be used.
Change-Id: Ibae5b91869848276785facfaef433e38d49fd726
57bd7b717b