add verbose option to runtests.sh
add verbose option to runtests.sh

Summary: hide skipped tests by default. makes running `runtest.sh` with filters easier to read.

Reviewed By: samwgoldman

Differential Revision: D3054949

fb-gh-sync-id: a6c5acb095b31b0acead5ec015dc7aee42cdbdf6
shipit-source-id: a6c5acb095b31b0acead5ec015dc7aee42cdbdf6

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