MRP-2150 tests: several ha.sh fixes

Remove hardcoded SIMUL and IOR pathes.
Add -p max failover period parameter.
Add -r dry run parameter.
Add "iozone" load.
Add the possibilities:
-- to run with mpich2 and openmpi;
-- to set the mpi threads per client number.

Signed-off-by: Elena Gryaznova <Elena_Gryaznova@xyratex.com>
Change-Id: I74882328a09abec76f0d0836f9319551b7c52c07
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/4090
Tested-by: Jenkins
Reviewed-by: Alexander Zarochentsev <alexander_zarochentsev@xyratex.com>
Tested-by: Elena Gryaznova <elena.gryaznova@seagate.com>
Reviewed-by: Vitaly Fertman <vitaly.fertman@seagate.com>