Update abc imports

Author: kabilar

datajoint/condition.py

@@ -1,7 +1,7 @@
 """ methods for generating SQL WHERE clauses from datajoint restriction conditions """
 
 import inspect
-import collections
+import collections.abc
 import re
 import uuid
 import datetime

datajoint/settings.py

@@ -7,6 +7,7 @@
 import pprint
 import logging
 import collections
+import collections.abc
 from enum import Enum
 from .errors import DataJointError
 

datajoint/table.py

@@ -1,4 +1,4 @@
-import collections
+import collections.abc
 import itertools
 import inspect
 import platform