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In 7288d464a2de48c49a7ca290aa4a5fa453baa4e1, it was assumed that a
default realm was configured on clients when it was not. This caused
lookup failures because GSSAPI canonicalized to an empty realm string.
However, since GSSAPI will automatically select the client-requested
principal if it exists in the ccache, there's no need for the name
logic at all.
(pykerberos's getServerPrincipalDetails sure is a thing - it iterates through the keytab and performs prefix matching on the shortname of each principal it finds, returning the first one that matches.)