Correcting .gitreview repo path after rename

Repository was renamed from cookbook-openstack-metering to
cookbook-openstack-telemetry. Updating .gitreview to point to the new
repository url. Added 'defaultbranch' attribute for
'stable/grizzly'. Adding in a rubocop.yml that will skip all errors, as
rubocop style checker was added during the havana cycle.

Change-Id: Ie2292c521ed8b92940ecae564ecc54aed35add6d