multi: Add itest for funding timeout

This commit adds an integration test that
verifies the funding timeout behavior in the
funding manager, in dev/integration test.
Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>

server.go

@@ -1449,6 +1449,8 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 	if lncfg.IsDevBuild() {
 		devCfg = &funding.DevConfig{
 			ProcessChannelReadyWait: cfg.Dev.ChannelReadyWait(),
+			MaxWaitNumBlocksFundingConf: cfg.Dev.
+				GetMaxWaitNumBlocksFundingConf(),
 		}
 
 		reservationTimeout = cfg.Dev.GetReservationTimeout()