According to the recommendation of the openstack wiki, every
patchset merged in openstack with in the commit message a flag
'co-authored-by' or 'also-by' will be considered for the commits
statistics.
Examples:
Co-Authored-By: An User <user@os.org>
Also-By: An User 2 <user2@os.org>
Change-Id: Ia58235c129061942963d34f860230097c64a9828
Implements: blueprint add-support-co-authored-by