Resolve TROVE-2018-002: bug 24700 KIST use-after-free can be remotely triggered

The use-after free KIST bug that we fixed as legacy/trac#24700 (moved) can, it turns out, be triggered remotely, causing relays to crash.

This bug only affects relays and bridges, and only if they are running 0.3.2.1-alpha through 0.3.2.9, or 0.3.3.1-alpha. It is fixed in 0.3.2.10 and 0.3.3.2-alpha.

Tracked as TROVE-2018-002 and CVE-2018-0491.

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