[krbdev.mit.edu #5697] make ccache handle referrals better

[Jeffrey Altman via RT]

Tom Yu via RT wrote:
> Ouch.  It looks like t_cc fails because it attempts to use some
> human-readable strings instead of valid ASN.1 for the actual encoded
> "ticket" when storing a credential.

Note that kx509 stores X.509 certificates in the cache using krb5_cc and
 there is at least one site that is using the ccache to store SSH
private keys.

I don't think that failure to parse a ticket should result in the ticket
not being stored in the ccache under the requested name.