Fix error reporting prefix for kadmin list
Fix error reporting prefix for kadmin list

Pass the function name into foreach_principal instead of the static
"get" string, so the correct function is reported in errors in
kadmin list.

Signed-off-by: Love Hornquist Astrand <c5e2f0824a6b8bf7ea1d693b4c00a7e90e09ef7a@h5l.org>

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal