Add octopus repository on W+ releases

This patch adds the Ceph octopus repository when the release
is W+; this is a requirement to be able to install the cephadm
package on the overcloud images.

Change-Id: If56c388d8283c93ae8bcb2af3e775d8f6d19b704

tripleo_repos/main.py

@@ -404,8 +404,10 @@ def _install_repos(args, base_path):
                 content = _create_ceph(args, 'jewel')
             elif args.branch in ['queens', 'rocky']:
                 content = _create_ceph(args, 'luminous')
-            else:
+            elif args.branch in ['stein', 'train', 'ussuri', 'victoria']:
                 content = _create_ceph(args, 'nautilus')
+            else:
+                content = _create_ceph(args, 'octopus')
             _write_repo(content, args.output_path)
         elif repo == 'opstools':
             content = OPSTOOLS_REPO_TEMPLATE % {'mirror': args.mirror}

tripleo_repos/tests/test_main.py

@@ -305,7 +305,10 @@ class TestTripleORepos(testtools.TestCase):
             'queens': 'luminous',
             'rocky': 'luminous',
             'stein': 'nautilus',
-            'master': 'nautilus',
+            'train': 'nautilus',
+            'ussuri': 'nautilus',
+            'victoria': 'nautilus',
+            'master': 'octopus',
         }
         args = mock.Mock()
         args.repos = ['ceph']