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

markmc/oslo.packaging,markmc/oslo.packaging