LU-10152 tests: reformat after conf-sanity test 99

LU-10152 tests: reformat after conf-sanity test 99

conf-sanity test 99 reformats an OST with options that need
to be cleared to allow future tests to complete successfully.

Reformatting the file system will clear the OST format options.

Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I32be4bab5a22b9e5f939c6478c96255db30dc0eb
Reviewed-on: https://review.whamcloud.com/29717
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Casper <jamesx.casper@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>