- Only apply default anon ciphers if gnutlsPriorityString is NULL and
Authentication Mode is set to anon. Otherwise we do not set them
as they overwrite custom Ciphers.
- Added two tests for custom cipher configuration (anon/certvalid mode).
- Add call for applyGnutlsPriorityString if gnutlsPriorityString changes.
- Merged openssl init code from Connect into osslInitSession
closes: https://github.com/rsyslog/rsyslog/issues/4686