added dependancies for apt and yum cookbooks to manage zabbix repository
added service name due to packages having a slightly diffrent init
script name
added attribute for service name to support diffrence between
template and package names of startup scripts
moved service name to an attribute to allow for the diffrence
between the template and the packaged startup scripts
change service to node attibute to support the diffrence between
the template and packaged versions of the startup script
add repositories for zabbix repos using either the apt or yum
cookbooks
define the default zabbix repo locations.  Update these node
attributes to point to an alternative repository
install zabbix agent via package by setting the install_method
attribute