sslutil: allow fingerprints to be specified in [hostsecurity]
We introduce the [hostsecurity] config section. It holds per-host
security settings.
Currently, the section only contains a "fingerprints" option,
which behaves like [hostfingerprints] but supports specifying the
hashing algorithm.
There is still some follow-up work, such as changing some error
messages.
#require docutils gettext
$ $TESTDIR/check-gendoc sv
checking for parse errors