CA-136746: Fix Create_SR method for class StorageHandlerHBA.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Reviewed-by: Vineeth Raveendran <vineeth.thampi@citrix.com>

GitHub: closes #16 on xenserver/xencert
CA-137289: Fix XenCert for xs64bit.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Reviewed-by: Vineeth Raveendran <vineeth.thampi@citrix.com>

GitHub: closes #17 on xenserver/xencert
CA-139258: Fix functional tests on iSCSI SR

Raise an exception from within xencert when iscsiadm discovery fails and
abort any further tests.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
Reviewed-by: Mate Lakat <mate.lakat@citrix.com>

GitHub: closes #18 on xenserver/xencert
CA-142337: Fix retVal of GetLunInformation

The current implementation of this method never sets the retVal to False
which leads to some spurious messages being printed on the report.

This patch sets the retVal to False when it can't find the required file
from '/dev/disk/by-scsibus/'

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>