[PATCH] debug public key print

[Andrew Somerville]

Hi all,

Attached is patch for feature to print the full public key of all
key-based login attempts when debug level is set to 1 or above. It was
written in the course of debugging/forensic analysis.

Looking for comments on merge worthiness.

Enhancement ticket can be seen here:
     https://bugzilla.mindrot.org/show_bug.cgi?id=2939

Github pull request here:
    https://github.com/openssh/openssh-portable/pull/112
(made before I realized they're not the preferred method of contribution)

    Andrew
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