libafsauthent: export more afsconf_ functions

libafsauthent: export more afsconf_ functions

We have new functions for (among other things) typed keys, and generic
rx identity management; expose them as well as the legacy key- and user-
management functions, on both Unix and Windows.

Reviewed-on: https://gerrit.openafs.org/13127
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit cdd1f16f5ef52093a8f7d3f87a45775d3c87b780)

Change-Id: Ia9ab364fcac10822ba50eb7f418a2228ac0fd935
Reviewed-on: https://gerrit.openafs.org/13179
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Joe Gorse <jhgorse@gmail.com>
Reviewed-by: Marcio Brito Barbosa <mbarbosa@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>