Added support for LOCATE operation

kmip/core/repo/mem_repo.py

@@ -45,3 +45,10 @@ class MemRepo(ManagedObjectRepo):
             return False
         del self.repo[uuid]
         return True
+
+    def locate(self, maximum_items, storage_status_mask,
+               object_group_member, attributes):
+        # TODO - search objects, find one with matching attrs
+        if "1" in self.repo:
+            return [self.repo["1"]]
+        return None