'Initializes the connection and returns connection information.
The iscsi driver returns a driver_volume_type of \'iscsi\'.
The format of the driver data is defined in _get_iscsi_properties.
Example return value::
\'driver_volume_type\': \'iscsi\'
\'data\': {
\'target_discovered\': True,
\'target_iqn\': \'iqn.2010-10.org.openstack:volume-00000001\',
\'target_portal\': \'127.0.0.0.1:3260\',
\'volume_id\': 1,'

def initialize_connection(self, volume, connector):

    LOG.debug('initialize_connection    volume    id=%(volume_id)s    connector    initiator=%(initiator)s', {'volume_id': volume['id'], 'initiator': connector['initiator']})
    return self.common.initialize_connection(volume, connector)
