Fixing onos-mininet to work with screen v4.06.*

Change-Id: I4c0be30c891eb593a40c3482957fc1b0125e37e5
diff --git a/tools/test/bin/onos-mininet b/tools/test/bin/onos-mininet
index 4c60e42..0af3860 100755
--- a/tools/test/bin/onos-mininet
+++ b/tools/test/bin/onos-mininet
@@ -16,6 +16,7 @@
 #       requires logname to NOT be given while in v4.05 it is optional (as long as -L is the
 #       last parameter on the command line).
 [[ $screenversion > "4.04" ]] && screenlog=$log
+[[ $screenversion > "4.05" ]] && screenlog="-Logfile $log"
 mininet="ssh -t -t $remote screen -L $screenlog -S mininet"
 
 case $cmd in