Add internal properties to message type

The internal properties can be used to tag messages when they're
published and processed in hooks later on.

Update sample server with Eclipse Paho test case

Merge pull request DrmagicE#135 from DrmagicE/dev

fix(federation): fix deadlock

Merge pull request DrmagicE#127 from DrmagicE/dev

disable reload command

Merge pull request DrmagicE#97 from DrmagicE/dev

fix test

fix: Fix max packet size validation

Merge pull request DrmagicE#60 from DrmagicE/federation

feat: add �federation plugin.

feat: add dump_packet option to log config

Merge pull request DrmagicE#39 from DrmagicE/auth

feat: add simple username/password auth plugin

log validate