I think the problem is related with token expiration. Although I added the "reauthentication_auth_method=trusts" parameter, the system works inconsistently and sometimes gives cinder resource not found error. The default timeout for token expiration was one hour. When I increased expiration value in [token] section in /etc/keystone/keystone.conf file, it seems the system works properly. I will re-create the stacks and test a few times to ensure that everything works properly.