Replace deprecated import of ABCs from collections

ABCs in collections should be imported from collections.abc and direct
import from collections is deprecated since Python 3.3.

Closes-Bug: #1936667
Change-Id: Ie82a523b4f8ab3d44d0fc9d70cb1ca6c059cc48f

manila/share/drivers/netapp/utils.py

@@ -15,7 +15,7 @@
 #    under the License.
 """Utilities for NetApp drivers."""
 
-import collections
+from collections import abc
 import decimal
 import platform
 import re
@@ -107,7 +107,7 @@ def convert_to_list(value):
         return []
     elif isinstance(value, six.string_types):
         return [value]
-    elif isinstance(value, collections.Iterable):
+    elif isinstance(value, abc.Iterable):
         return list(value)
     else:
         return [value]

manila/tests/api/contrib/stubs.py

@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import collections
+from collections import abc
 import datetime
 
 from manila.common import constants
@@ -68,7 +68,7 @@ def stub_share(id, **kwargs):
 
     # NOTE(ameade): We must wrap the dictionary in an class in order to stub
     # object attributes.
-    class wrapper(collections.Mapping):
+    class wrapper(abc.Mapping):
         def __getitem__(self, name):
             if hasattr(self, name):
                 return getattr(self, name)