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.
The _get_records function currently returns the first 100 records. As our TXT is added most recently, if you have > 100 records it will not be returned.
I've changed the function to sort by ID DESC, so it will always return the latest 100 records.
Even though DNSimple is technically covered with lexicon not all
systems can install python pip's easily. For these systems it is useful
to have pure shell script API interactions.
