Zabbix configured to listen for the vip_won / vip_lost upstart event.

Changed upstart config for zabbix to only start on the vip_won event (and stop on shutdown or vip_lost). 

keepalived now generates these upstart events.

This has several +'s:
1) more responsive keepalived scripts they don't block for zabbix to get itself all sorted out. 
2) Recheffing doesn't restart zabbix. 
3) might be genially useful system wide event to plug in things that need to know about vip changes,,, pens I'm looking at you.  
Looks like an extra space here.