Subject: Keyring last_change_time implementation isn't useful
The cc_keyring.c implementation of last_change_time from r20743 records
the last change time in memory only, so all you find out is the last time
that particular handle was resolved, initialized, or stored into. You
don't find out anything about the underlying cache.
The kernel key API does not appear to have timestamps (we should verify
this), so fixing this will probably require adding a new key to the cache
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