Ubiquiti removed keytool (and java) from recent releases of Unifi OS. This moves from keytool to openssl's native pkcs12.
Tested on Unifi Dream Machine which runs Unifi OS and a built-in Unifi controller.
Also added backup of existing files prior to change in case anything goes wrong, and update system configuration with compatible ciphers.
reduce TTL for the TXT record from 3600 to 300 to have an easier way to replicate changes for the dns-verification in case multiple submissions for a specific record/domain are done within an hour.
_saveaccountconf_mutable instead of _saveaccountconf now used.
Co-Authored-By: kapper.net support account <33451837+kappernet@users.noreply.github.com>
