Test gerrit and github drivers in same tenant

Only sources which use the same connection as the event originates from
are queried for changes. This avoids eg. querying the change on
different gerrit or github than the event originated from.

Change-Id: Ie1c5b223d4eec13c18f2381c3e387a0ca7801137
Co-Authored-By: Jesse Keating <omgjlk@us.ibm.com>
8 files changed