Please backport sslh 1.18-1 (universe) from yakkety

[Nobuto Murata]

Please backport sslh 1.18-1 (universe) from yakkety to xenial.

Reason for the backport:
========================

* new feature: SNI and ALPN based policies
* new feature: keepalive support
and more https://github.com/yrutschle/sslh/blob/master/ChangeLog

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s yakkety -d xenial sslh

* xenial:
[ ] Package builds without modification
[ ] sslh installs cleanly and runs
[ ] sslh-dbgsym installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of sslh. For reverse-build-dependencies (-Indep), please test that the package still builds against the new sslh. For reverse-dependencies, please test that the version of the package currently in the release still works with the new sslh installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

sslh
----
* libnet-proxy-perl
  [ ] xenial (Reverse-Conflicts)

sslh-dbgsym
-----------

[Silke Meyer (sil-ke)]

This would be great!