Log Message:
sslh: update to 1.20.

v1.20: 20NOV2018
	Added support for socks5 protocol (Eugene Protozanov)

	New probing method:
	Before, probes were tried in order, repeating on the
	same probe as long it returned PROBE_AGAIN before
	moving to the next one. This means a probe which
	requires a lot of data (i.e. returne PROBE_AGAIN for
	a long time) could prevent sucessful matches from
	subsequent probes. The configuration file needed to
	take that into account.

	Now, all probes are tried each time new data is
	found. If any probe matches, use it. If at least one
	probe requires more data, wait for more. If all
	probes failed, connect to the last one. So the only
	thing to know when writing the configuration file is
	that 'anyprot' needs to be last.

	Test suite heavily refactored; `t` uses `test.cfg`
	to decide which probes to test and all setup is
	automatic; probes get tested with 'fast' (entire
	first message in one packet) and 'slow' (one byte at
	a time); when SNI/ALPN are defined, all combinations
	are tested.

	Old 'tls' probe removed, 'sni_alpn' probe renamed as 'tls'.
	You'll need to change 'sni_alpn' to 'tls' in
	your configuration file, if ever you used it.