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This allows the 'no trivial auth' option introduced by the previous commit to be tested. Uppity has grown three new options to make it accept "none" authentication, keyboard-interactive involving no prompts, and the perverse sending of USERAUTH_SUCCESS after a signatureless public-key offer. The first of those options also enables the analogue in SSH-1; the other two have no SSH-1 analogues in the first place. (SSH-1 public key authentication has a challenge-response structure that doesn't contain any way to terminate the exchange early with success. And the TIS and CryptoCard methods, which are its closest analogue of k-i, have a fixed number of prompts, which is not 0.)