Adding Keystone to MDG Dockerfiles

Included environment files.
Admin password selection and storage needs to be discussed.

Change-Id: Ibcaa818bcc3ae6fd013507b0b114b15b70e60150
Signed-off-by: Eduardo Sousa <esousa@whitestack.com>
diff --git a/docker/Makefile b/docker/Makefile
index b0dc1f1..0dcb3df 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -13,5 +13,5 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 #
-SUBDIRS = MON NBI osmclient RO LCM light-ui pm
+SUBDIRS = MON NBI osmclient RO LCM light-ui pm Keystone
 include mk/dirs.mk