Allow a little more time for flows to settle before checking

Change-Id: I78d955301d63656609f75c9d134b1e62eac18286
diff --git a/tools/test/bin/onos-check-ipv4-flows b/tools/test/bin/onos-check-ipv4-flows
index 44d321f..7a851ca 100755
--- a/tools/test/bin/onos-check-ipv4-flows
+++ b/tools/test/bin/onos-check-ipv4-flows
@@ -22,7 +22,7 @@
         cat $aux
         exit 0
     else
-        sleep 1
+        sleep 2
     fi
 done
 cat $aux