Auto generate AUTHORS file for glanceclient component.

Bug: 976267

Now that git commits are gated by CLA, we shouldn't enforce
committers to add an entry in AUTHORS file. The AUTHORS file
should be generated automatically, based on git commits.

This commit fixes the problem.

* AUTHORS
  Remove this file.

* .gitignore
  Add AUTHORS file.

* glanceclient/openstack/common/setup.py
  Sync changes from openstack-common.

* setup.py
  Generate AUTHORS file before creating the package.

* glanceclient/shell.py
  Pep8 fix.

* tests/test_authors.py
  Remove this test case.

Change-Id: I9e9d4da5ca3b147b483250dcf25a3b2a840123c2

setup.py

@@ -3,6 +3,7 @@ import sys
 
 import setuptools
 
+from glanceclient.openstack.common.setup import generate_authors
 from glanceclient.openstack.common.setup import parse_requirements
 from glanceclient.openstack.common.setup import parse_dependency_links
 from glanceclient.openstack.common.setup import write_git_changelog
@@ -12,6 +13,7 @@ requires = parse_requirements()
 dependency_links = parse_dependency_links()
 tests_require = parse_requirements(['tools/test-requires'])
 write_git_changelog()
+generate_authors()
 
 if sys.version_info < (2, 6):
     requires.append('simplejson')