Fix generation of Guru Meditation Report

Generation of a guru medidation report fails with TypeError when
trying to serialize config group options. This is due to the fact,
that I018c3a408a8903be8d006760994de6947fb91168 registers `barbican`
options group incorrectly: an OptGroup instance is passed where a
string name is expected (keystoneauth1 wraps the passed value
into OptGroup unconditionally).

A follow up change to oslo.config will make sure we fail early in
case an incorrect value has been been passed to register_group().

Change-Id: I4c57127c7bc0098000ad18ba7bab12fbc66d8ac0
Closes-Bug: #1568208

nova/conf/barbican.py

@@ -37,7 +37,7 @@ barbican_opts = [
 def register_opts(conf):
     conf.register_group(barbican_group)
     conf.register_opts(barbican_opts, group=barbican_group)
-    ks_loading.register_session_conf_options(conf, barbican_group)
+    ks_loading.register_session_conf_options(conf, barbican_group.name)
 
 
 def list_opts():

nova/keymgr/barbican.py

@@ -75,7 +75,7 @@ class BarbicanKeyManager(key_mgr.KeyManager):
         try:
             _SESSION = ks_loading.load_session_from_conf_options(
                 CONF,
-                nova.conf.barbican.barbican_group)
+                nova.conf.barbican.barbican_group.name)
 
             auth = ctxt.get_auth_plugin()
             service_type, service_name, interface = (CONF.

nova/tests/functional/regressions/test_bug_1568208.py

@@ -0,0 +1,34 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+from oslo_reports import guru_meditation_report as gmr
+
+from nova import test
+from nova import version
+
+
+class TestServerGet(test.TestCase):
+
+    def test_guru_meditation_report_generation(self):
+        """Regression test for bug #1568208.
+
+        This test ensures a text guru meditation report can be generated
+        successfully and generation does not fail e.g. due to incorrectly
+        registered config options.
+
+        """
+
+        # NOTE(rpodolyaka): we are only interested in success of run() call
+        # here, it's up to oslo_reports tests to check the generated report
+        generator = gmr.TextGuruMeditation(version)
+        generator.run()