wg_cookie: ensure gc is called regularly

Previously we relied on gc being called when adding a new entry, which
could leave us in a gc "blind spot". With this change, we schedule a
callout to run gc whenever we have entries in the table. The callout
will continue to run every ELEMENT_TIMEOUT seconds until the table is
empty.

Access to rl_gc is locked by rl_lock, so we will never have any threads
racing to callout_{pending,stop,reset}.

The alternative (which Linux does currently) is just to run the callout
every ELEMENT_TIMEOUT (1) second even when no entries are in the table.
However, the callout solution proposed here seems simple enough.

Signed-off-by: Matt Dunwoodie <ncon@noconroy.net>

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