Add --version argument

Change-Id: I6d67e0b5b9d7dbae400ec94bdf41e2e1b47fa509

os_apply_config/apply_config.py

@@ -27,6 +27,7 @@ from os_apply_config import collect_config
 from os_apply_config import config_exception as exc
 from os_apply_config import renderers
 from os_apply_config import value_types
+from os_apply_config import version
 
 TEMPLATES_DIR = os.environ.get('OS_CONFIG_APPLIER_TEMPLATES', None)
 if TEMPLATES_DIR is None:
@@ -197,6 +198,8 @@ def parse_opts(argv):
                              ' not subject to type restrictions. If --key is'
                              ' specified and no default is specified, program'
                              ' exits with an error on missing key.')
+    parser.add_argument('--version', action='version',
+                        version=version.version_info.version_string())
     opts = parser.parse_args(argv[1:])
 
     return opts

os_apply_config/version.py

@@ -0,0 +1,18 @@
+# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
+#
+#    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 pbr.version
+
+version_info = pbr.version.VersionInfo('os-apply-config')