Run server and agentd on FreeBSD

[AlexWhite]

Allow to present two scripts for start zabbix_server and zabbix_agentd for FreeBSD.
I hope they will be useful.

[edeus]

Thanks Alex,

One point to note in newer FreeBSD versions (5.5 and 6.x) the .sh extension needs to be dropped if you want rcorder functionality (rcorder is how it knows to execute a service before a dependant service).

[AlexWhite]

It is glad if it was useful. Thanks for the remark.