CA-151444: Update verfification form to add optional Test: XC.MultiPath

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
CA-151444: Update certification guide to extend support for alternate multipath configurations.

Updated this document to reflect steps to be performed in order to
support alternate multipath configurations.

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