配置项

• cluster
• emqx-auth-clientid
• emqx-auth-http
• emqx-auth-jwt
• emqx-auth-ldap
• emqx-auth-mongo
• emqx-auth-mysql
• emqx-auth-pgsql
• emqx-auth-redis
• emqx-auth-username
• emqx-bridge-mqtt
• emqx-coap
• emqx-dashboard
• emqx-lwm2m
• emqx-management
• emqx-reloader
• emqx-retainer
• emqx-rule-engine
• emqx-sn
• emqx-statsd
• emqx-stomp
• emqx-web-hook