refactoring roles to use galaxy
removing old roles
adding missing dep
adding ruby role to jenkins
remove non-existing role from zabbix playbook
update ssh_keys in group_vars/all
zabbix_checks block requires some vars from zabbix_server
fixing issue where anchors were being consumed before being set
zabbix_username wasn't set
documenting group_vars/all
rename all to all.yaml
updating README
adding login details for zabbix
change zabbix nodeid
add missing zabbix/agent block
move zabbix-agent to zabbix playbook