Merge #9940: Fix verify-commits on OSX, update for new bad Tree-SHA512, point travis to different keyservers
df5bae2 Update trusted-sha512-root-commit for new bad tree hash (Matt Corallo)
efc06c2 If GNU sha512sum is missing, try perl shasum in verify-commits (Matt Corallo)
8ed849f Fix travis failing to fetch keys from the sks keyserver pool (Matt Corallo)
fd5e905 Make verify-commits.sh non-recursive (Matt Corallo)
Tree-SHA512: 457cc81d6e0a77ab32d030ecd058c59857f22cb998a1394593e115639081f3fdc74a6376035b77be0712ad5cb9143bc3f498b77e99eb66034492dbbb38c39bc6