Replace notification.conf with monasca-notification.conf

notification.conf is the deprecated path for the configuration file.
The new path is /etc/monasca/monasca-notification.conf .

Note: devstack is still using the deprecated configuration file. This
will be change in another changeset (against openstack/monasca-api).

Change-Id: I9ef1d7149308893544ad4d6fef4f3281da676171
Story: 2004862
Task: 29103

monasca_notification/config.py

@@ -12,7 +12,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from oslo_config import cfg
 from oslo_log import log
+import sys
 import yaml
 
 from monasca_notification import conf
@@ -39,8 +41,9 @@ def parse_args(argv, no_yaml=False):
 
     CONF(args=argv,
          project='monasca',
-         prog='notification',
+         prog=sys.argv[1:],
          version=version.version_string,
+         default_config_files=_get_config_files(),
          description='''
          monasca-notification is an engine responsible for
          transforming alarm transitions into proper notifications
@@ -60,6 +63,25 @@ def parse_args(argv, no_yaml=False):
     _CONF_LOADED = True
 
 
+def _get_config_files():
+    """Get the possible configuration files accepted by oslo.config
+
+    This also includes the deprecated ones
+    """
+    # default files
+    conf_files = cfg.find_config_files(project='monasca',
+                                       prog='monasca-notification')
+    # deprecated config files (only used if standard config files are not there)
+    if len(conf_files) == 0:
+        old_conf_files = cfg.find_config_files(project='monasca',
+                                               prog='notification')
+        if len(old_conf_files) > 0:
+            LOG.warning('Found deprecated old location "{}" '
+                        'of main configuration file'.format(old_conf_files))
+            conf_files += old_conf_files
+    return conf_files
+
+
 def set_from_yaml():
     if CONF.yaml_config:
         LOG.info('Detected usage of deprecated YAML configuration')

releasenotes/notes/use-standard-config-file-path-f3da49d0d655377c.yaml

@@ -0,0 +1,7 @@
+---
+deprecations:
+  - |
+    Configuration file path /etc/monasca/notification.conf is deprecated.
+    Use the standard path /etc/monasca/monasca-notification.conf or the
+    configuration dir (supported via oslo.config)
+    /etc/monasca/monasca-notification.conf.d/any_config_name.conf