test: skip test if host is too slow

test-http-server-consumed-timeout will fail if the host is sufficiently
loaded that a 25ms interval takes more than 200ms to be invoked. Skip
the test in that situation.

PR-URL: https://github.com/nodejs/node/pull/15688
Fixes: https://github.com/nodejs/node/issues/14312


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>