selftests: netfilter: Avoid hanging ipvs.sh

If the client can't reach the server, the latter remains listening
forever. Kill it after 5s of waiting.

Fixes: 867d219 ("selftests: netfilter: add ipvs test script")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Author: Phil Sutter

tools/testing/selftests/net/netfilter/ipvs.sh

@@ -97,7 +97,7 @@ cleanup() {
 }
 
 server_listen() {
-	ip netns exec "$ns2" socat -u -4 TCP-LISTEN:8080,reuseaddr STDOUT > "${outfile}" &
+	ip netns exec "$ns2" timeout 5 socat -u -4 TCP-LISTEN:8080,reuseaddr STDOUT > "${outfile}" &
 	server_pid=$!
 	sleep 0.2
 }