Support release 4.x users format

Author: satterly

alertaclient/models/user.py

@@ -31,9 +31,9 @@ def parse(cls, json):
         return User(
             id=json.get('id'),
             name=json.get('name'),
-            email=json.get('email'),
+            email=json.get('email', None) or json.get('login'),
             status=json.get('status'),
-            roles=json.get('roles', list()),
+            roles=json.get('roles', None) or ([json['role']] if 'role' in json else list()),
             attributes=json.get('attributes', dict()),
             create_time=DateTime.parse(json.get('createTime')),
             last_login=DateTime.parse(json.get('lastLogin')),