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 Cloud and Classic Manager work with different APIs, and so require
a separate module, which we introduce here.
The README has also been modified to state that the two are separate
and incompatible, and provides instructions on using either.
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