basic, rbd and rbd-nomount subsuites are expanded to run with each
of ms_mode=legacy, ms_mode=crc and ms_mode=secure. This increases
the total number of jobs in the suite from 100 to 220.
fsx, singleton and thrash subsuites choose ms_mode at random (from
the above plus ms_mode=prefer-crc).
unmap and wac subsuites remain msgr1-only.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
