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

Change-Id: I77b0517422569f9ef559b2cf7c7d954713c74de5
Closes-Bug: #1627313

muranoclient/client.py

@@ -11,10 +11,11 @@
 #    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 muranoclient.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('muranoclient',
+                                                 version, 'client')
     client_class = getattr(module, 'Client')
     return client_class(*args, **kwargs)

muranoclient/common/utils.py

@@ -33,7 +33,7 @@ import zipfile
 from oslo_log import log as logging
 from oslo_serialization import jsonutils
 from oslo_utils import encodeutils
-from oslo_utils import importutils
+
 import prettytable
 import requests
 import six
@@ -165,13 +165,6 @@ def env(*vars, **kwargs):
     return kwargs.get('default', '')
 
 
-def import_versioned_module(version, submodule=None):
-    module = 'muranoclient.v%s' % version
-    if submodule:
-        module = '.'.join((module, submodule))
-    return importutils.import_module(module)
-
-
 def exit(msg=''):
     if msg:
         print(encodeutils.safe_encode(msg), file=sys.stderr)

muranoclient/shell.py

@@ -31,6 +31,7 @@ from oslo_log import handlers
 from oslo_log import log as logging
 from oslo_log import versionutils
 from oslo_utils import encodeutils
+from oslo_utils import importutils
 import six
 import six.moves.urllib.parse as urlparse
 
@@ -194,7 +195,8 @@ class MuranoShell(object):
 
         self.subcommands = {}
         subparsers = parser.add_subparsers(metavar='<subcommand>')
-        submodule = utils.import_versioned_module(version, 'shell')
+        submodule = importutils.import_versioned_module('muranoclient',
+                                                        version, 'shell')
         self._find_actions(subparsers, submodule)
         self._find_actions(subparsers, self)