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/recover.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 RecoverRequestPayload(primitives.Struct):
+class RecoverRequestPayload(base.RequestPayload):
     """
     A request payload for the Recover operation.
 
@@ -36,9 +37,7 @@ class RecoverRequestPayload(primitives.Struct):
             unique_identifier (string): The ID of the managed object (e.g.,
                 a public key) to recover. Optional, defaults to None.
         """
-        super(RecoverRequestPayload, self).__init__(
-            enums.Tags.REQUEST_PAYLOAD
-        )
+        super(RecoverRequestPayload, self).__init__()
 
         self._unique_identifier = None
         self.unique_identifier = unique_identifier
@@ -151,7 +150,7 @@ class RecoverRequestPayload(primitives.Struct):
         })
 
 
-class RecoverResponsePayload(primitives.Struct):
+class RecoverResponsePayload(base.ResponsePayload):
     """
     A response payload for the Recover operation.
 
@@ -167,9 +166,7 @@ class RecoverResponsePayload(primitives.Struct):
             unique_identifier (string): The ID of the managed object (e.g.,
                 a public key) that was recovered. Optional, defaults to None.
         """
-        super(RecoverResponsePayload, self).__init__(
-            enums.Tags.RESPONSE_PAYLOAD
-        )
+        super(RecoverResponsePayload, self).__init__()
 
         self._unique_identifier = None
         self.unique_identifier = unique_identifier