Fix ironic datasource info 'secret' field not set
Fix ironic datasource info 'secret' field not set

ironic datasource driver should also add 'secret' field in
get_datasource_info() otherwise it causes KeyError exception

Change-Id: I505d47364e6dbe43fb607bc7ff86e5c4d783a86e

ramineni/my_congress,ramineni/my_congress,openstack/congress,ramineni/my_congress,ekcs/congress,openstack/congress,ramineni/my_congress,ekcs/congress,ekcs/congress,ekcs/congress