Add ProxyKmipClient demos for the new attribute operations

This change adds ProxyKmipClient demos for the new Set, Modify,
and Delete Attribute operations. The demos are not intended for
general use but instead to show how the client can be used to
execute these new operations against a KMIP server. See the
demo scripts themselves for more information.

Partially implements #547

kmip/demos/utils.py

@@ -229,6 +229,33 @@ def build_cli_parser(operation):
             dest="attribute_names",
             help="List of attribute names to retrieve, defaults to all "
                  "attributes")
+    elif operation is Operation.MODIFY_ATTRIBUTE:
+        parser.add_option(
+            "-i",
+            "--uuid",
+            action="store",
+            type="str",
+            default=None,
+            dest="uuid",
+            help="UID of a managed object")
+    elif operation is Operation.DELETE_ATTRIBUTE:
+        parser.add_option(
+            "-i",
+            "--uuid",
+            action="store",
+            type="str",
+            default=None,
+            dest="uuid",
+            help="UID of a managed object")
+    elif operation is Operation.SET_ATTRIBUTE:
+        parser.add_option(
+            "-i",
+            "--uuid",
+            action="store",
+            type="str",
+            default=None,
+            dest="uuid",
+            help="UID of a managed object")
     elif operation is Operation.LOCATE:
         parser.add_option(
             "--offset-items",