The python-keystonemiddleware is needed by swift-proxy-server otherwise
the systemd service fails to start with the following error:
[...]
File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 517, in _context_from_explicit
swift-proxy-server[11639]: value = import_string(found_expr)
File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 22, in import_string
swift-proxy-server[11639]: return pkg_resources.EntryPoint.parse("x=" + s).load(False)
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2321, in load
return self.resolve()
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2327, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
ImportError: No module named keystonemiddleware.auth_token
Implements: blueprint openstack-distribution-packages
Change-Id: I2aaddc0c6b3bb5c28eb7f9b45e8d989f2824724d