fix rspecs-ctrl-c
fix rspecs-ctrl-c

we can't fork off tinyserver without a lot of work in the test
codebase, so instead save a copy of the old rspec signal handler and then
after tinyserver has started (and we're sure that rack has scribbled
over the signal handler), restore the rspec signal handler.

there's an obvious race if someone hits ctrl-c after tinyserver has
scribbled over the sigint handler but before we restore it, but this is
99.9% better of a solution than nothing.

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