People rarely care about having all manifest branches locally. Change
the default to only pull down the selected branch. If people want other
branches, the -b option will fetch it automatically, or people can use
--no-current-branch.
This only applies to the manifest project syncing, not the rest of the
projects that are in the checkout.
Bug: https://crbug.com/gerrit/16194
Change-Id: Ia9e7e2f23b8028d82772db72dcc7d6c32260be79
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/343434
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: LaMont Jones <lamontjones@google.com>
39cb17f7a3