Add .gitreview file.
Add .gitreview file.

Which is used by OpenStack's git-review tool:

    https://docs.openstack.org/infra/git-review/

To set it up just run "git review --setup". A remote named "gerrit"
will be created. You can then add default reviewers to use like this:

    git config --local remote.gerrit.receivepack \
        "git receive-pack --re reviewer1 --re reviewer2"

Note that --re ns_server_dev won't work due to gerrit limitations.

If you don't always want to have all the reviewers see your changes,
you can create another remote like "gerrit-mute" without the
receivepack parameter set and then use "git review --remote
gerrit-mute".

Change-Id: I79d3e859651822ceeee6ae734323a3449274b35d
Reviewed-on: http://review.couchbase.org/87364
Tested-by: Aliaksey Artamonau <ce14b1c16e0fd654f926118eb8addbec5aff4ffa@couchbase.com>
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server