LU-6652 tests: replay-dual test 18 stats wrong file

LU-6652 tests: replay-dual test 18 stats wrong file

replay-dual test 18 touches file $MOUNT1/$tdir/$tfile and
then calls statmany on $MOUNT1/$tdir/f. File 'f' does not
exist and statmany fails. This is corrected by touching
$MOUNT1/$tdir/${tfile}0.

Test-Parameters: alwaysuploadlogs envdefinitions=ONLY=18 \
testlist=replay-dual

Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I27b51a1bdff17c4bbc4e9d261d01686612099069
Reviewed-on: http://review.whamcloud.com/14960
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Justin Miller <jmiller@cray.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>