Forwards to SpnegoAuthn.usernameFor() on the installed instance.
SpnegoAuthn.usernameFor()
Returns the username a session is for, from the principal a ticket named: the realm is stripped only when it is this KDC's own, case-sensitively.
the client principal, name@REALM
name@REALM
the username
Forwards to
SpnegoAuthn.usernameFor()on the installed instance.