Sanity check: GSSAPI SPI simplifications

[Greg Hudson]

On Tue, 2010-04-27 at 06:17 -0400, ghudson at MIT.EDU wrote:
> 3. The mechglue only ever invokes mech->gss_inquire_cred if you pass
> null credentials to gss_inquire_cred.

I was wrong about this; we also invoke mech->gss_inquire_cred in
gss_acquire_cred() (although we don't really have to; the Sun
implementation no longer does) and in gss_accept_sec_context().