basic zabbix role setup

zabbix-agent/handlers/main.yml

zabbix-agent/meta/main.yml

zabbix-agent/tasks/main.yml

zabbix-frontend/handlers/main.yml

zabbix-frontend/meta/main.yml

zabbix-frontend/tasks/main.yml

zabbix-proxy/TODO

zabbix-proxy/meta/main.yml

zabbix-repo/handlers/main.yml

zabbix-repo/tasks/main.yml

zabbix-server/handlers/main.yml

zabbix-server/meta/main.yml

zabbix-server/tasks/main.yml