remove test dependencies from openstack-base

these containers should not need unittest support packages
in general, tempest may need one of these but that should be
installed as needed not for all container images.

- testtools - introduced in
- unittest2 - introduced in Ia3a9756c58f0ead3b20e435f1d1546408f4a8b36
- zake - introduced in Ie05ba975bc2f88cd9ee896aafc60171d6ca8d10b
- fixtures - introduced in Ia3a9756c58f0ead3b20e435f1d1546408f4a8b36

Change-Id: Ic2325afc6ce3ee9f8a8c03ad19050809255df2f5

docker/openstack-base/Dockerfile.j2

@@ -65,7 +65,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
             'python2-pyasn1',
             'python2-PyMySQL',
             'python2-sysv_ipc',
-            'python2-zake',
             'python2-alembic',
             'python2-amqp',
             'python-anyjson',
@@ -87,7 +86,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
             'python-elasticsearch',
             'python-enum34',
             'python2-extras',
-            'python2-fixtures',
             'python-futures',
             'python-glanceclient',
             'python-gnocchiclient',
@@ -146,12 +144,10 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
             'python2-stevedore',
             'python-swiftclient',
             'python-tempita',
-            'python-testtools',
             'python-tooz',
             'python2-traceback2',
             'python-troveclient',
             'python-unicodecsv',
-            'python-unittest2',
             'python2-urllib3',
             'python-vitrageclient',
             'python-warlock',