LU-6385 tests: sync I/O in obdfilter-survey

This ensures I/O is synced before each test.  Previous patch
http://review.whamcloud.com/14143

 works only with the Lustre test
framework.  This will ensure I/O is always sysnced.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ib19a9e4afd8ca83deceb78fe8fdb4d231da0bc40
Reviewed-on: http://review.whamcloud.com/16942


Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

lustre-iokit/obdfilter-survey/obdfilter-survey

@@ -525,14 +525,10 @@ for ((rsz = $rszlo; rsz <= $rszhi; rsz*=2)); do
 
 			# run tests
 			for test in ${tests[@]}; do
-				# Sync all outstanding data
-				for host in ${ost_hosts[@]}; do
-					remote_shell $host \
-					    "lctl set_param -n osd*.*OST*.force_sync 1"
-				done
-
 				declare -a pidarray
 				for host in ${unique_hosts[@]}; do
+					remote_shell $host \
+					    "lctl set_param -n osd*.*OST*.force_sync 1"
 					echo "starting run for test: $test rsz: $rsz " \
 					"threads: $thr objects: $nobj" >> ${vmstatf}_${host}
 				done