Do not overwrite the drvlink variable

References: bnc#803760
Signed-off-by: Michal Marek <mmarek@suse.cz>
(cherry picked from commit 6304594ab7a02376701b9610054798f914ba46dd)
Support second ibft iscsi interface

References: bnc#830968
(cherry picked from commit 8bdf93a829ff39bff6ce7729fa98e4bb027a40fc)