Adding payloads for the GetAttributeList operation

This change adds request and response payloads for the GetAttributeList
operation. It updates the payload factories to support these new objects
and updates and adds all associated or required test suites. A new
exception is also included that is thrown by objects attempting to parse
invalid KMIP encodings.

kmip/core/exceptions.py

@@ -0,0 +1,21 @@
+# Copyright (c) 2015 The Johns Hopkins University/Applied Physics Laboratory
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+class InvalidKmipEncoding(Exception):
+    """
+    An exception raised when processing invalid KMIP message encodings.
+    """
+    pass