Fixed several bugs in vpn-watch script.

Fixed several bugs in vpn-watch script.

The counter was pending between 0 and 1 and not going up to 9.

If ipsec whack is returning and empty page we do not need to check
if the remoteip has changed because the tunnel is not up.

If ipsec is restarted the counter can be reset.

All these facts causes that on low powered system the tunnels are
intable if you have a lot of them. But we need to check if the
convergation timer is okay because with these bugs the tunnels
were minutly restarted and with correct handling after 10.