Make method import_versioned_module work

Oslo.utils 3.17 provides similar function, just use it.
For more information:
[1] http://docs.openstack.org/developer/oslo.utils/history.html

Closes-Bug: #1627313

Change-Id: Ie738e910cc72535fe97295d7e118eda2412ecd15

heatclient/client.py

@@ -10,10 +10,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from heatclient.common import utils
+from oslo_utils import importutils
 
 
 def Client(version, *args, **kwargs):
-    module = utils.import_versioned_module(version, 'client')
+    module = importutils.import_versioned_module('heatclient',
+                                                 version, 'client')
     client_class = getattr(module, 'Client')
     return client_class(*args, **kwargs)

heatclient/common/utils.py

@@ -21,7 +21,6 @@ import uuid
 
 from oslo_serialization import jsonutils
 from oslo_utils import encodeutils
-from oslo_utils import importutils
 import prettytable
 import six
 from six.moves.urllib import error
@@ -239,13 +238,6 @@ def find_resource(manager, name_or_id):
         raise exc.CommandError(msg)
 
 
-def import_versioned_module(version, submodule=None):
-    module = 'heatclient.v%s' % version
-    if submodule:
-        module = '.'.join((module, submodule))
-    return importutils.import_module(module)
-
-
 def format_parameters(params, parse_semicolon=True):
     '''Reformat parameters into dict of format expected by the API.'''
 

heatclient/shell.py

@@ -348,7 +348,8 @@ class HeatShell(object):
 
         self.subcommands = {}
         subparsers = parser.add_subparsers(metavar='<subcommand>')
-        submodule = utils.import_versioned_module(version, 'shell')
+        submodule = importutils.import_versioned_module('heatclient',
+                                                        version, 'shell')
         self._find_actions(subparsers, submodule)
         self._find_actions(subparsers, self)
         self._add_bash_completion_subparser(subparsers)