catch exposed cs.exceptions instead of novaclient

cloud/rax

@@ -162,8 +162,6 @@ except ImportError:
     print("failed=True msg='pyrax is required for this module'")
     sys.exit(1)
 
-import novaclient.exceptions
-
 ACTIVE_STATUSES = ('ACTIVE', 'BUILD', 'HARD_REBOOT', 'MIGRATING', 'PASSWORD',
                    'REBOOT', 'REBUILD', 'RESCUE', 'RESIZE', 'REVERT_RESIZE')
 FINAL_STATUSES = ('ACTIVE', 'ERROR')
@@ -368,14 +366,12 @@ def cloudservers(module, state, name, flavor, image, meta, key_name, files,
         except ValueError:
             try:
                 image = cs.images.find(human_id=image)
-            except (novaclient.exceptions.NotFound,
-                    pyrax.exceptions.NotFound,
-                    pyrax.exceptions.NoUniqueMatch):
+            except(cs.exceptions.NotFound,
+                   cs.exceptions.NoUniqueMatch):
                 try:
                     image = cs.images.find(name=image)
-                except (novaclient.exceptions.NotFound,
-                        pyrax.exceptions.NotFound,
-                        pyrax.exceptions.NoUniqueMatch):
+                except (cs.exceptions.NotFound,
+                        cs.exceptions.NoUniqueMatch):
                     module.fail_json(msg='No matching image found (%s)' %
                                          image)