[rql sources] uses an URL as remote host address for pyro/zmq rql sources, instead of extra configuration parameters. Follows modification of dbapi.connect api. Closes #2539822

from os.path import join
from cubicweb.toolsutils import create_dir

option_renamed('pyro-application-id', 'pyro-instance-id')

create_dir(join(config.appdatahome, 'backup'))