CP-4498: Added relaxed check mode to allow iSCSI SRs during XSM

Signed-off-by: Bob Ball bob.ball@citrix.com
CP-4498: Added comment to ensure mode is not enabled by an accidental refactor

Signed-off-by: Bob Ball bob.ball@citrix.com
Merge pull request #1177 from BobBall/cp-4498

CR-1207: Merge CP-4498 into Clearwater