Add State filtering support for the Locate operation

This change updates Locate operation support in the PyKMIP server,
allowing users to filter objects based on the object's State. Unit
tests and integration tests have been added to test and verify the
correctness of this feature.

Additionally, the Locate demo scripts have also been updated to
support State filtering. Simply use the "--state" flag to specify
a State enumeration for the Locate script to filter on.

kmip/demos/utils.py

@@ -252,6 +252,14 @@ def build_cli_parser(operation=None):
                 "'Tue Jul 23 18:39:01 2019'"
             )
         )
+        parser.add_option(
+            "--state",
+            action="store",
+            type="str",
+            default=None,
+            dest="state",
+            help="The state of the secret (e.g., PRE_ACTIVE, ACTIVE)"
+        )
     elif operation is Operation.REGISTER:
         parser.add_option(
             "-f",