Reduce risk of exit crashes: don't leave the context in a stuck state when shutting_down. That doesn't just leak it, it leaks the rewrite driver, which we then have to try to force-shutdown which may also try to delete the RewriteContext if it's used in fetch, potentially blowing up on stats access.
Reduce risk of exit crashes: don't leave the context in a stuck state
when shutting_down. That doesn't just leak it, it leaks the rewrite driver,
which we then have to try to force-shutdown which may also try to delete the
RewriteContext if it's used in fetch, potentially blowing up on stats access.

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