Uncomment the 'node.proto_dist' to support docker env

etc/emq.conf

@@ -238,7 +238,7 @@ node.crash_dump = {{ platform_log_dir }}/crash.dump
 ##  - inet6_tcp: handles TCP with IPv6 addressing.
 ##
 ## vm.args: -proto_dist inet_tcp
-## node.proto_dist = inet_tcp
+node.proto_dist = inet_tcp
 
 ## Sets the net_kernel tick time. TickTime is specified in seconds.
 ## Notice that all communicating nodes are to have the same TickTime