[krbdev.mit.edu #7123] [BUG] poor error message when /tmp is not writable

[Greg Hudson via RT]

Can you identify the specific mod_auth_krb5 source code in use in this 
scenario?

The GSSAPI library is capable of generating more specific error messages 
based on the minor code, if the calling application does the right thing.  The version of mod_auth_krb5 I looked at ought to generate a message based 
on the minor code... but it also shouldn't have needed to read from or 
write to a ccache when calling that function.  So I'm probably looking at 
the wrong code.