Update key generation

[KomelT]

#272

[Hunter275]

@KomelT

We shouldn't need to generate the Admin Key, it will be the key of another device.

We should also add a confirmation dialog for generating a new Private Key.

I will add these to #272

[KomelT]

@Hunter275 yes you are right, I miss-read the comment. Thanks.

[jp-bennett]

Key generation seems to be working as expected now. There are a couple little issues I've seen. First, having legacy admin enabled actually disables the private key field, where it should be disabling the admin key. (Though technically both can be turned on if somebody really wanted to).

Next, I don't understand the submit button, as none of the other fields have this. It does seem to be required to get settings to stick, to hit submit first, then the save icon.

And finally, if a user pasts a private key in to the field, this should blank out the public key, so the firmware will regenerate the appropriate key. Nevermind, the web app correctly regenerates the public key, and I didn't notice. 0=)