Author: Simo Sorce <simo(a)redhat.com>
Date: 2020-10-28 (Wed, 28 Oct 2020)
Clarify mech_for_saslname implementation note
There is nothing to actually fix in this function unless we change how
interposing works. Add a note and remove the FIXME.
Signed-off-by: Simo Sorce <simo(a)redhat.com>