Split logs into test cases to prevent overwriting

refs #2907

Change-Id: Ia7ca07fe0d7cd7428dbba5db443e87983aaaca3f
diff --git a/test_linkfail/ping.sh b/test_linkfail/ping.sh
index 99954f3..17a7af3 100755
--- a/test_linkfail/ping.sh
+++ b/test_linkfail/ping.sh
@@ -3,6 +3,7 @@
 source ../multi-host.conf
 
 LOGPREFIX=$1
+STRATEGY=$2
 
 ndnping -c 25 /B &> logs/${LOGPREFIX}_ping_A.log