added role type and user system role db entities and handlers, as well as related objects

src/python/dm/common/objects/roleType.py

+#!/usr/bin/env python
+
+from dmObject import DmObject
+
+class RoleType(DmObject):
+
+    DEFAULT_KEY_LIST = [ 'id', 'name', 'description' ]
+
+    def __init__(self, dict):
+        DmObject.__init__(self, dict)
+

src/python/dm/common/objects/userSystemRole.py

+#!/usr/bin/env python
+
+from dmObject import DmObject
+
+class UserSystemRole(DmObject):
+
+    DEFAULT_KEY_LIST = [ 'user_id', 'role_type_id' ]
+
+    def __init__(self, dict):
+        DmObject.__init__(self, dict)
+