Update rbvmoni-zabbix.rb: new feature Deprovisioning group and other stuff

* Added new method deprov_zbxHost(hostName, deprovGroup)
* Added ability to choose what to do when host is deprovisioned (delete or move to deprovGroup)
* changed log file name from test.log to rbvmoni-zabbix.log
Merge pull request #7 from jaganz/patch-3

 Update rbvmoni-zabbix.rb: new feature Deprovisioning group and other stuff