Fix init-repository.py's --no-gerrit option

The argument should not be added to the mutually exclusive group
but to the parser itself to make it usable with upstream checkouts
as well.

Change-Id: If2361c7beb0463a471cea9ce01e18a51abeed4ee
Reviewed-by: Jeff Rogers <jrogers@blackberry.com>
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Fix the build on Mac

clang complains about unknown scoped_refptr

Change-Id: Iee7590f9ad45cab55a5918bf1c756aa769fa3fd9
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Add update_change_ids.py to update Change-Ids of a set of patches

This will be useful when updating the snapshot and rebasing patches.
These patches need updated IDs to keep the gerrit database happy.

Change-Id: I62e9fc11a902f57497a2693cc59b873f13cfce12
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>