Fix driver initialization with config properties for the right method (T1784)
Proposed fix for the bug reported in T1784
The method kolab_2fa::get_driver() is called with the full factor ID (<method>:<uuid>)
and therefore fails to retrieve the right properties from plugin config. This change fixes this at the right place.
Reviewed By: machniak
Differential Revision: https://git.kolab.org/D242