Configuration changes

The dpsk module now supports dynamic expansion of the filename parameter.
radiusd.conf now contains an unlang section, which controls new behavior for the return statement.
New configuration parameters for TEAP which makes it much easier to configure. See the teap section of the eap module.
Change idle timeout for incoming radsec connections, to better match behavior of radsecproxy.
python2 and rlm_couchbase are no longer available in the alpine docker image.
utmp files are becoming obsolete due to 32-bit time. unix/radwtmp have been commented out in the default config and radlast is no longer installed if last is not present on the system.

Feature improvements

Print MD5 hash of the configuration files in debug mode. This helps people track configuration changes.
Add support for IPv6 to "abinary" type. The fields are the same as for "ip", but use "ipv6", and IPv6 formatted addresses.
Update radclient to make it clear that Message-Authenticator is added to all Access-Request packets, even if the input file does not contain it.
Add support for Subject AltName URI. Closes #5450.
Add python_path_mode option to python3 module.
Relax checks on OpenSSL minor versions for OpenSSL 3.x.
Add API for deleting dynamic home servers.
Set SO_KEEPALIVE on outbound sockets, so firewalls are less likly to close TCP connections.
Allow querying of statistics when home_server has src_ipaddr set. See FreeRADIUS-Stats-Server-Src-IP-Address. Fixes #5483
Update dictionary "man" page. Fixes #4346.
Change jlibtool to use --show-config, to avoid conflicts with clang --config. Fixes #5442.
RADIUS/TLS clients now support a tls subsection. For connections from this client, this section is used in preference to the "listen" TLS settings. This allows a server to easily present different identities to different clients.
RADIUS/TLS has been updated for TLS-PSK and TLS 1.3. Tested with radsecproxy.

For EAP-TLS, send TLS start without a length field. Some clients refuse to do EAP-TLS when this field exists.
Avoid blocking TLS sockets on corner cases during session setup.
Update home server stats.
Correct error message about untrusted certs. Fixes #5466.
Use PyEval_RestoreThread to swap to main thread. Fixes #5111
Don't run Python detach function on config check.
Fix a number of issues with TLS connections and check_client_connections = yes.
Be more careful about managing the incoming queue when databases block the server. The server will still be unable to make progress, but it should crash less. Whether or not this is a good thing is unknown.
Better handler single-character expansions. Fixes #2216.
Correct calculation of EAP length in pre-proxy. Fixes #5486.
Don't segfault when using detail listeners. Fixes #5485
Add build check for Couchbase v2, rlm_couchbase won't build on v3.