Added the following monitoring items to zabbix
 . IP route monitoring
 . MySQL monitoring
 . Zabbix memory usage
 . check that the major BCPC services are up
 . VIP hosting

Added the following triggers
 . IP routes change
 . VIP jumps
 . MySQL is not rpingable for a headnode
 . Excessive client errors in MySQL
 . A BCPC service goes down
typo fix
added -n option to arp to avoid problems with a funky name server
Merge pull request #38 from caiush/master

Added some extra monitoring to zabbix