Autoremove gone virtual_server

All files in /etc/keepalived/concat which are not defined in the puppet catalogue should be purged.
Merge pull request #9 from jiuka/patch-1

Autoremove gone virtual_server
Add virtualhost parameter for virtual_server
Add some puppetdoc for keepalived::virtual_server.
Add vrrp_instance parameter for vrrp_instance
Add some puppetdoc for keepalived::vrrp_instance.
Added define type for vrrp_scripts.