fixup! Add possibility to provide headers for login requests

Signed-off-by: Benny Fuhry <benny@cheffu.de>

Author: BFuhry

src/redfish/rest/v1.py

@@ -977,7 +977,7 @@ def _rest_request(self, path, method='GET', args=None, body=None,
         else:
             raise RetriesExhaustedError() from cause_exception
 
-    def login(self, username=None, password=None, auth=AuthMethod.SESSION, headers=()):
+    def login(self, username=None, password=None, auth=AuthMethod.SESSION, headers={}):
         """Login and start a REST session.  Remember to call logout() when"""
         """ you are done.