krb5_cc_gen_new

[Nicolas Williams]

Ok, let me try a different approach: what will become of the hint, will
it appear in the ccache backend (file, MLSA, MEMORY, CCAPI, ...)
immediately?  Can it be set via a separate function?  Why no hint in
krb5_cc_resolve() (krb5_cc_resolve() can be used to create ccaches too)?

The hint may actually be useful in some contexts, but not in others --
you propose that it be optional, after all.  So why not make it so it
can be set via a separate function?