Display project_id for cluster template

Since we display project_id for clusters, see no reason in not
showing it for the templates.

Change-Id: I74caec23234c13c53cecbe7bb91aa0eef236d566

magnumclient/osc/v1/cluster_templates.py

@@ -52,6 +52,7 @@ CLUSTER_TEMPLATE_ATTRIBUTES = [
     'flavor_id',
     'master_lb_enabled',
     'dns_nameserver',
+    'project_id',
     'hidden',
     'tags',
 ]

magnumclient/tests/osc/unit/v1/fakes.py

@@ -185,6 +185,7 @@ class FakeClusterTemplate(object):
             'flavor_id': 'm1.medium',
             'master_lb_enabled': False,
             'dns_nameserver': '8.8.8.8',
+            'project_id': uuid.uuid4().hex,
             'hidden': False,
             'tags': "",
         }