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/derive_key.py

@@ -21,9 +21,10 @@ from kmip.core import exceptions
 from kmip.core import objects
 from kmip.core import primitives
 from kmip.core import utils
+from kmip.core.messages.payloads import base
 
 
-class DeriveKeyRequestPayload(primitives.Struct):
+class DeriveKeyRequestPayload(base.RequestPayload):
     """
     A request payload for the DeriveKey operation.
 
@@ -68,9 +69,7 @@ class DeriveKeyRequestPayload(primitives.Struct):
                 cryptographic object. Optional, defaults to None. Required
                 for read/write.
         """
-        super(DeriveKeyRequestPayload, self).__init__(
-            enums.Tags.REQUEST_PAYLOAD
-        )
+        super(DeriveKeyRequestPayload, self).__init__()
 
         self._object_type = None
         self._unique_identifiers = None
@@ -434,7 +433,7 @@ class DeriveKeyRequestPayload(primitives.Struct):
         })
 
 
-class DeriveKeyResponsePayload(primitives.Struct):
+class DeriveKeyResponsePayload(base.ResponsePayload):
     """
     A response payload for the DeriveKey operation.
 
@@ -461,9 +460,7 @@ class DeriveKeyResponsePayload(primitives.Struct):
                 newly derived cryptographic object. Optional, defaults to
                 None.
         """
-        super(DeriveKeyResponsePayload, self).__init__(
-            enums.Tags.RESPONSE_PAYLOAD
-        )
+        super(DeriveKeyResponsePayload, self).__init__()
 
         self._unique_identifier = None
         self._template_attribute = None