Add missing openstacklib and keystone dependencies

The ceph module includes a class from openstacklib and the keystone
providers for keystone integration. This change adds in this dependency
to the metadata.json to capture this requirement. These are only
required for keystone integration if you plan on using the ceph class to
set those up.

Change-Id: Iab834f775aad54b0545e791337ea7b76a5daee4b

metadata.json

@@ -70,6 +70,15 @@
         {
             "name": "duritong/sysctl",
             "version_requirement": ">=0.0.1 <1.0.0"
+        },
+        {
+            "name": "openstack/openstacklib",
+            "version_requirement": ">=9.0.0"
+        },
+        {
+            "name": "openstack/keystone",
+            "version_requirement": ">=9.0.0"
         }
+
     ]
 }