Handle authors existed before VCS was around.
Handle authors existed before VCS was around.

Bug: 976267

The list of such authors are stored in AUTHORS.in file. When
auto generating AUTHORS file, include them as well.

* openstack/common/setup.py
  __doc__: For all methods, remove space and include period.
  generate_authors(): If AUTHORS.in file exist, append the
  content to AUTHORS file.

Change-Id: I05da1e561383cc151e7ef34e75a4600e3afdda6e

klmitch/pbr,citrix-openstack-build/pbr,emonty/oslo-packaging,WiFast/pbr,klmitch/pbr,WiFast/pbr,openstack-dev/pbr,openstack-dev/pbr,JioCloud/pbr,citrix-openstack-build/pbr,redhat-openstack/pbr,openstack-dev/pbr,citrix-openstack-build/pbr,emonty/oslo-packaging,JioCloud/pbr,redhat-openstack/pbr,varunarya10/pbr,varunarya10/pbr