add a note about reload_cmd blocking
add a note about reload_cmd blocking

okushchenko/confd,blippar/confd,israelchen/confd,kelseyhightower/confd,okushchenko/confd,rancher/confd,blippar/confd,bacongobbler/confd,Fitbit/confd,rancher/confd,israelchen/confd,kelseyhightower/confd,bacongobbler/confd,Fitbit/confd