LU-9273 tests: disable random I/O in replay-ost-single/5

disable random I/O in replay-ost-single/5 as it's very slow
on ZFS - this is due to grants as the client consume them
way too quickly: 1MB blocksize + ~0.5MB metadata overhead
for each random 4K written by iozone.

Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5
Test-Parameters: trivial ostcount=7 clients=2 ostfilesystemtype=zfs mdtfilesystemtype=zfs testlist=replay-ost-single envdefinitions=SLOW=yes,ONLY=5

Change-Id: Ic49429b8c681fdc16e5f95f483d78198b6f4804c
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: https://review.whamcloud.com/31671
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>