net-misc/sslh: upgrade to 1.18

This CL imports net-misc/sslh from upstream Gentoo with the following
modifications:
- Downgrade EAPI from 6 to 5
- Add src_prepare to apply patches via epatch
- Change KEYWORDS to "*"

BUG=chromium:760784
TEST=Trybot runs on paladin and release builders.
TEST=Test ssh and adb connection to a DUT.

Change-Id: Ie6f10c9ceb43aa0213b74bd77fc912e8a0a67470
Reviewed-on: https://chromium-review.googlesource.com/643553
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
8 files changed