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.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown