LU-7605 test: Skip sanityn test_78

LU-7605 test: Skip sanityn test_78

Skip sanityn test_78 if server version is older than 2.7.58

Test-Parameters: trivial testlist=sanityn

Change-Id: Ief602524f72cdab73c39ec1181f99bb27b33da37
Signed-off-by: Wei Liu <wei3.liu@intel.com>
Reviewed-on: https://review.whamcloud.com/19055
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>