[reSIProcate] TLS SNI server support, Let's Encrypt / ACME DVSNI

[Daniel Pocock]

Udit recently contributed a patch[1] for TLS SNI client support, he is
also looking at server support

I've added some comments about server support in Bugzilla:

https://www.resiprocate.org/bugzilla/show_bug.cgi?id=130

and I've also added an issue for Let's Encrypt / ACME support, which
could use Domain Validation with SNI (DVSNI):

https://www.resiprocate.org/bugzilla/show_bug.cgi?id=131