Adding the Pie ProxyKmipClient

This change adds the Pie ProxyKmipClient, which provides a simplified
version of the original KMIP interface and which wraps the original
client. The ProxyKmipClient supports basic CRUD operations for
symmetric, public, and private keys. A unit test suite for the client is
included.

kmip/pie/exceptions.py

@@ -0,0 +1,50 @@
+# 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 ClientConnectionFailure(Exception):
+    """
+    An exception raised for errors with the client socket connection.
+    """
+    pass
+
+
+class ClientConnectionNotOpen(Exception):
+    """
+    An exception raised when operations are issued to a closed connection.
+    """
+    def __init__(self):
+        """
+        Construct the closed client connection error message.
+        """
+        super(ClientConnectionNotOpen, self).__init__(
+            "client connection not open")
+
+
+class KmipOperationFailure(Exception):
+    """
+    An exception raised upon the failure of a KMIP appliance operation.
+    """
+    def __init__(self, status, reason, message):
+        """
+        Construct the error message for the KMIP operation failure.
+
+        Args:
+            status: a ResultStatus enumeration
+            reason: a ResultReason enumeration
+            message: a string providing additional error information
+        """
+        msg = "{0}: {1} - {2}".format(status.name, reason.name, message)
+        super(KmipOperationFailure, self).__init__(msg)