Move iscsi flags back to driver.py

During the lvm class create the iscsi flags were moved.
This is NOT correct, the flags belong with the ISCSI class
and should have been left in driver.py where ISCSIDriver
is defined.

Moving these breaks the inheritance structure for all those that
inherit from ISCSIDriver.

Change-Id: I1fda9158d9f8f01005875b87265d2dd87bcbc67f
Merge "Move iscsi flags back to driver.py"