AMBARI-26522 : Fix imports for collections

ambari-common/src/main/python/ambari_jinja2/ambari_jinja2/runtime.py

@@ -261,7 +261,10 @@ def __repr__(self):
 
 # register the context as mapping if possible
 try:
-  from collections import Mapping
+  try:
+    from collections.abc import Mapping
+  except ImportError:
+    from collections import Mapping
 
   Mapping.register(Context)
 except ImportError:

ambari-common/src/main/python/ambari_jinja2/ambari_jinja2/sandbox.py

@@ -74,7 +74,10 @@
 
 #: register Python 2.6 abstract base classes
 try:
-  from collections import MutableSet, MutableMapping, MutableSequence
+  try:
+    from collections.abc import MutableSet, MutableMapping, MutableSequence
+  except ImportError:
+    from collections import MutableSet, MutableMapping, MutableSequence
 
   _mutable_set_types += (MutableSet,)
   _mutable_mapping_types += (MutableMapping,)

ambari-common/src/main/python/ambari_jinja2/ambari_jinja2/utils.py

@@ -547,7 +547,10 @@ def __reversed__(self):
 
 # register the LRU cache as mutable mapping if possible
 try:
-  from collections import MutableMapping
+  try:
+    from collections.abc import MutableMapping
+  except ImportError:
+    from collections import MutableMapping
 
   MutableMapping.register(LRUCache)
 except ImportError: