converted to use newer eventlet *rev 455 at least*, got rid of channels completely

* sip_msrp_client.py: fixed reaction to sip but not msrp closed and vice versa (test with :end sip, :end msrp commands)
* fixed messages to include msrp uri of the first host
* added --accept-all option to automatically answer all calls
* do not drop lines starting with : if not a command
* echo the entered linem not only if a message was sent

darcs-hash:20081125093816-b2873-b75444bf69fcd856a3d097d8ef389479db7f9cef