Pass Ironic API url to deploy ramdisk in PXE driver

Ironic's API url should be passed to deploy ramdisk for callback
via vendor passthru interface. API url gets from config option or
Keystone catalog.
Also node uuid used for deployment_id instead of id.

Change-Id: I8d190e107e73466fc96dd8896a8282bae22a020e
Merge "Pass Ironic API url to deploy ramdisk in PXE driver"