Add guru meditation support

After this, kill -s SIGUSR2 <tacker-server-pid> will make tacker
server report its running configuration.

Change-Id: I3823c6d79f264e570f4696cd644a5607558e577d

releasenotes/notes/guru-meditation-support-66a467c1c2746570.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add Guru Meditation support.
+    Command "kill -s SIGUSR2 <tacker-server-pid>"
+    will make tacker server emit running configuration.

requirements.txt

@@ -32,6 +32,7 @@ oslo.log>=3.11.0 # Apache-2.0
 oslo.messaging>=5.14.0 # Apache-2.0
 oslo.middleware>=3.0.0 # Apache-2.0
 oslo.policy>=1.17.0 # Apache-2.0
+oslo.reports>=0.6.0 # Apache-2.0
 oslo.rootwrap>=5.0.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
 oslo.service>=1.10.0 # Apache-2.0

tacker/cmd/__init__.py

@@ -0,0 +1,28 @@
+# All Rights Reserved.
+#
+#    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.
+
+import logging as sys_logging
+
+from oslo_reports import guru_meditation_report as gmr
+
+from tacker import version
+
+# During the call to gmr.TextGuruMeditation.setup_autorun(), Guru Meditation
+# Report tries to start logging. Set a handler here to accommodate this.
+logger = sys_logging.getLogger(None)
+if not logger.handlers:
+    logger.addHandler(sys_logging.StreamHandler())
+
+_version_string = version.version_info.release_string()
+gmr.TextGuruMeditation.setup_autorun(version=_version_string)