MRP-1984 tests: fix large-lun test_1, test_2 defects

setupall()->start ost called at the end of large-lun.sh
fails to start the ost devices which leads test_1() and
test_2() fail if run separately.
The reasons are:
1) osts data are destroyed by test_1()->llverdev
2) osts are reformatted by test_2, but mds config not changed
Patch fixes the following:
- format lustre at the end of test_1() and test_2()
- add the "REFORMAT" option check to avoid killing
filesystems that do not want a reformat.

Signed-off-by: Elena Gryaznova <Elena_Gryaznova@xyratex.com>
Change-Id: Ifaeea3e4b3008ae6a72e5e4dc6923840f12437ff
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/3311
Reviewed-by: Vladimir Saveliev <vladimir_saveliev@xyratex.com>
Tested-by: Jenkins
Tested-by: Elena Gryaznova <elena_gryaznova@xyratex.com>
Reviewed-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
MRP-1826 tests: skip sanity test_187a, test_187b on old MDS

Don't run sanity test_187a, test_187b in interop mode for
MDS's versions older than 2.3.0 (per file data_version
implementation was included in 2.3, LU-827).

Signed-off-by: Elena Gryaznova <Elena_Gryaznova@xyratex.com>
Change-Id: Ibfa2b6ba5c8f9df342e72d6e7da4f9715f23753e
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/3538
Reviewed-by: Vladimir Saveliev <vladimir_saveliev@xyratex.com>
Tested-by: Elena Gryaznova <elena_gryaznova@xyratex.com>
Tested-by: Jenkins
Reviewed-by: Vitaly Fertman <vitaly_fertman@xyratex.com>