correct the parameter of typedef void (*EMqtt_Sn_Client_Connect_Cb)(...)
Add (void *data) in each callback parameter
comment the printf
Merge branch 'master' of https://github.com/JulienMasson/emqtt into JulienMasson-master

Conflicts:
	src/lib/emqtt_server.c
Merge branch 'JulienMasson-master'