Correct tag name for tc:approved-release

The OpenStack Technical Committee recently changed the name of the
'tc-approved-release' tag to 'tc:approved-release'.[1]  This patch
modifies stackalytics to account for the new name.

[1] https://review.openstack.org/#/c/393185/

Closes-bug: #1647903

Change-Id: I181626aab389c19bc1e6fcddf4941d5cfec1cc60

etc/default_data.json

@@ -26589,10 +26589,10 @@
             "modules": ["openstack-official", "governance", "api-wg", "openstack-user-stories"]
         },
         {
-            "id": "tc-approved-release",
-            "title": "tc-approved-release",
+            "id": "tc:approved-release",
+            "title": "tc:approved-release",
             "child": true,
-            "modules": ["tc-approved-release"]
+            "modules": ["tc:approved-release"]
         },
         {
             "id": "type:service",

etc/test_default_data.json

@@ -297,10 +297,10 @@
             "modules": ["openstack-official", "governance", "api-wg"]
         },
         {
-            "id": "tc-approved-release",
-            "title": "tc-approved-release",
+            "id": "tc:approved-release",
+            "title": "tc:approved-release",
             "child": true,
-            "modules": ["tc-approved-release"]
+            "modules": ["tc:approved-release"]
         },
         {
             "id": "type:service",

etc/test_projects.yaml

@@ -22,7 +22,7 @@ Sahara:
         - openstack/sahara-extra
         - openstack/sahara-image-elements
       tags:
-        - tc-approved-release
+        - "tc:approved-release"
         - release:managed
         - release:cycle-with-milestones
         - release:has-stable-branches

stackalytics/processor/governance.py

@@ -23,7 +23,7 @@ from stackalytics.processor import utils
 LOG = logging.getLogger(__name__)
 
 # list of supported tags
-TAGS = ['tc-approved-release', 'type:service', 'type:library']
+TAGS = ['tc:approved-release', 'type:service', 'type:library']
 
 
 def _make_module_group(module_groups, name):

stackalytics/tests/unit/test_governance.py

@@ -42,7 +42,7 @@ Sahara:
         - openstack/sahara-extra
         - openstack/sahara-image-elements
       tags:
-        - tc-approved-release
+        - tc:approved-release
         - release:managed
         - release:cycle-with-milestones
         - release:has-stable-branches
@@ -74,9 +74,9 @@ class TestGovernance(testtools.TestCase):
                             'sahara-image-elements', 'sahara-specs'},
                 'tag': 'program'
             },
-            'tc-approved-release': {
-                'id': 'tc-approved-release',
-                'module_group_name': 'tc-approved-release',
+            'tc:approved-release': {
+                'id': 'tc:approved-release',
+                'module_group_name': 'tc:approved-release',
                 'modules': set(),
                 'releases': {
                     'liberty': {'sahara', 'sahara-extra',