py-asyncssh: updated to 1.15.1
Release 1.15.1:
Added callback-based host validation in SSHClient, allowing callers to decide programmatically whether to trust server host keys and certificates rather than having to provide a list of trusted values in advance.
Changed SSH client code to only load the default known hosts file if if exists. Previously an error was returned if a known_hosts value wasn’t specified and the default known_hosts file didn’t exist. For host validate to work in this case, verification callbacks must be implemented or other forms of validation such as X.509 trusted CAs or GSS-based key exchange must be used.
Fixed known hosts validation to completely disable certificate checks when known_hosts is set to None. Previously, key checking was disabled in this case but other checks for certificate expiration and hostname mismatch were still performed, causing connections to fail even when checking was supposed to be disabled.
Switched curve25519 key exchange to use the PyCA implementation, avoiding a dependency on libnacl/libsodium. For now, support for Ed25519 keys still requires these libraries, but once that support appears in PyCA, it may be possible to remove this dependency entirely.
Added get_fingerprint() method to return a fingerprint of an SSHKey.
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