Boolean inversion in whitelist hostname-malformed check

[cmilloy]

https://github.com/twosigma/satellite/blob/bb39fe0602050ca47eabf4ed13c0f1d0a792983f/satellite-master/src/satellite/services/whitelist.clj#L63

(.isReachable addr 1000)

Should probably say: (not (.isReachable addr 1000))