Clean imports in code

This patch set modifies lines which are importing objects
instead of modules. As per openstack import guide lines, user should
import modules in a file not objects.

http://docs.openstack.org/developer/hacking/#imports

Change-Id: I0c6036d18065e83799056b9184efa6f18c1b6c19

vitrageclient/v1/cli/template.py

@@ -16,7 +16,7 @@ from cliff import lister
 from cliff import show
 from oslo_log import log
 
-from vitrageclient.common.exc import CommandException
+from vitrageclient.common import exc
 from vitrageclient.common import utils
 
 LOG = log.getLogger(__name__)
@@ -37,7 +37,7 @@ class TemplateValidate(show.ShowOne):
     def take_action(self, parsed_args):
 
         if not parsed_args.path:
-            raise CommandException(message='No path requested, add --path')
+            raise exc.CommandException(message='No path requested, add --path')
 
         if parsed_args.path:
             result = self.app.client.template.validate(path=parsed_args.path)

vitrageclient/v1/cli/topology.py

@@ -11,7 +11,7 @@
 # under the License.
 
 from cliff import show
-from vitrageclient.common.exc import CommandException
+from vitrageclient.common import exc
 
 
 # noinspection PyAbstractClass
@@ -47,7 +47,7 @@ class TopologyShow(show.ShowOne):
         root = parsed_args.root
 
         if graph_type == 'graph' and limit is not None and root is None:
-            raise CommandException(
+            raise exc.CommandException(
                 message="Graph-type 'graph' requires a 'root' with 'limit'.")
 
         topology = self.app.client.topology.get(limit=limit,

vitrageclient/v1/template.py

@@ -13,7 +13,7 @@
 # under the License.
 import os
 from oslo_log import log
-from vitrageclient.common.exc import CommandException
+from vitrageclient.common import exc
 from vitrageclient.common import yaml_utils
 
 
@@ -74,4 +74,4 @@ class Template(object):
             except ValueError as e:
                 message = 'Could not load template file: %s. Reason: %s' \
                           % (path, e.message)
-                raise CommandException(message=message)
+                raise exc.CommandException(message=message)