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

def initialize_connection(self, volume, connector):

    iser_properties = self._get_iscsi_properties(volume)
    return {'driver_volume_type': 'iser', 'data': iser_properties}
