Don't override default ccache #41
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Leave the system's default ccache alone. It can still be overridden by kinit call when needed, or the environment can be set from the calling application.
The problem solved by this patch is that some systems will have the ccache configured as something other than MEMORY:krb5cc_sasl_auth . On my system it defaults to FILE:/tmp/krb5cc_${UID}, for example. Leaving the environment variable unset allows the defaults to apply.