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.
PR #3673 Fix simply.com API seems abandoned by maintainer and I need this fixed asap
Changes implemented
* Normalize JSON and fix not handling return code correctly
* Add some information to comments
* Fix trailing slash on URIs
* Add 60 second sleep for zone to be written
* Fix parsing record_data and record_type
