zabbix: drop changes to /run dir
    
    This was just added to help debug some startup problems, so we can drop
    it now. Also, it causes the playbook to be non idempotent (ie, this task
    runs and changes everytime the playbook it run, causing a lot of noise
    in the check/diff runs).
    /run/zabbix should get created by systemd, so no need to muck with it.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>