gss: samba member server returns incorrect error code with some versions of krb5

gss: samba member server returns incorrect error code with some versions of krb5

As per Simo's comments in https://bugzilla.redhat.com/show_bug.cgi?id=1279249
we need Samba to return the correct thing to the client when gss_accept_sec_context
returns a token along with an error.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11592

Signed-off-by: Richard Sharpe <rsharpe@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Nov 12 01:44:08 CET 2015 on sn-devel-104