LU-7972 tests: use $REFORMAT in test-framework.sh correctly

LU-7972 tests: use $REFORMAT in test-framework.sh correctly

$REFORMAT is always used incorrectly in test-framework.sh, because
as long as $REFORMAT is not null, format will be done, even if
REFORMAT=no.
This patch fixes this issue by setting/judging $REFORMAT=yes/no
explicitly.

Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: Iaabea34e0ad453b3f9f986009fa1f8bdec8a98ff
Reviewed-on: http://review.whamcloud.com/19276
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>