utils/watchcat: restart failure time after network restart

utils/watchcat: restart failure time after network restart

Without this change these settings:
Mode: Restart Interface
Period: 30s
Check Interval: 5s
will do ping every 30s, if all pings are fail then
it try to take action every 5 second.

After apply this patch watchcat will try to send
ping every 5 second in next 30 sec before take action if
all pings are fail.

This is important for wireless uplinks like 3G/4G that
need some time to establish connection.

Signed-off-by: Rozhuk Ivan <rozhuk.im@gmail.com>