LU-7089 tests: sanity test 99b: find: invalid mode ‘+4’

LU-7089 tests: sanity test 99b: find: invalid mode ‘+4’

Changes perm +4 pattern to perm /4. '+4' has deprecated.

Test-Parameters: envdefinitions=ONLY=99 clientdistro=sles12 testlist=sanity
Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: If5e04fece8d90193acd89cd42f61e3ee5e79064e
Reviewed-on: http://review.whamcloud.com/16177
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>