Add payload base classes to prepare for simplifying the client

This change adds payload request and response base classes to
prepare for future simplification updates to the current client
architecture. No new tests are required for this change.

kmip/core/messages/payloads/check.py

@@ -18,9 +18,10 @@ import six
 from kmip import enums
 from kmip.core import primitives
 from kmip.core import utils
+from kmip.core.messages.payloads import base
 
 
-class CheckRequestPayload(primitives.Struct):
+class CheckRequestPayload(base.RequestPayload):
     """
     A request payload for the Check operation.
 
@@ -55,7 +56,7 @@ class CheckRequestPayload(primitives.Struct):
                 lease should be available for on the checked object. Optional,
                 defaults to None.
         """
-        super(CheckRequestPayload, self).__init__(enums.Tags.REQUEST_PAYLOAD)
+        super(CheckRequestPayload, self).__init__()
 
         self._unique_identifier = None
         self._usage_limits_count = None
@@ -285,7 +286,7 @@ class CheckRequestPayload(primitives.Struct):
         })
 
 
-class CheckResponsePayload(primitives.Struct):
+class CheckResponsePayload(base.ResponsePayload):
     """
     A response payload for the Check operation.
 
@@ -320,7 +321,7 @@ class CheckResponsePayload(primitives.Struct):
                 lease should be available for on the checked object. Optional,
                 defaults to None.
         """
-        super(CheckResponsePayload, self).__init__(enums.Tags.RESPONSE_PAYLOAD)
+        super(CheckResponsePayload, self).__init__()
 
         self._unique_identifier = None
         self._usage_limits_count = None