LU-3764 tests: clean up sanity test_116a code style

LU-3764 tests: clean up sanity test_116a code style

Clean up the code style for sanity.sh test_116a():
- proper indentation
- don't use $ for variables inside $((...))
- one statement per line

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I5fe502b85365e00ce34b90f8fabfb58320a07e51
Reviewed-on: https://review.whamcloud.com/7882
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Steve Guminski <stephenx.guminski@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>