Updated chat/ejabberd to 2.0.3

* Do not ask certificate for client (c2s)
* Check digest-uri in SASL digest authentication
* Use send timeout to avoid locking on gen_tcp:send
* Fix ejabberd reconnection to database
* HTTP-Bind: handle wrong order of packets
* MUC: Improved traffic regulation management
* PubSub: Several bugfixes and improvements for best coverage of XEP-0060 v1.12
* Shared Roster Groups: push immediately membership changes
* Rotate also sasl.log on "reopen-log" command

(martti)