fix runtests.sh when skipping tests
fix runtests.sh when skipping tests

Summary:
before starting a test, `runtests.sh` prints `[ ] RUNNING` if the output is a TTY.

then if the test is skipped and you aren't in verbose mode, we print whitespace to erase that text, but we do it even if the output is not a TTY.

Reviewed By: gabelevi

Differential Revision: D4009723

fbshipit-source-id: e7cb1748a6f017f08476610f8f9cddb90dd7f1e7

AprilArcus/flow,jgrund/flow,nmote/flow,AprilArcus/flow,samwgoldman/flow,fletcherw/flow,mroch/flow,AgentME/flow,ForbesLindesay/flow,AprilArcus/flow,AgentME/flow,ForbesLindesay/flow,samwgoldman/flow,facebook/flow,nmote/flow,popham/flow,mroch/flow,popham/flow,AgentME/flow,samwgoldman/flow,claudiopro/flow,gabelevi/flow,jamesgpearce/flow,ForbesLindesay/flow,gabro/flow,TiddoLangerak/flow,ylu1317/flow,ylu1317/flow,fletcherw/flow,jgrund/flow,MichaelDeBoey/flow,AprilArcus/flow,TiddoLangerak/flow,AprilArcus/flow,ylu1317/flow,samwgoldman/flow,popham/flow,fletcherw/flow,AgentME/flow,facebook/flow,mroch/flow,MichaelDeBoey/flow,nmote/flow,JonathanUsername/flow,popham/flow,ForbesLindesay/flow,gabelevi/flow,MichaelDeBoey/flow,nmote/flow,fletcherw/flow,gabro/flow,jgrund/flow,facebook/flow,popham/flow,gabelevi/flow,facebook/flow,jamesgpearce/flow,MichaelDeBoey/flow,TiddoLangerak/flow,gabro/flow,jamesgpearce/flow,ForbesLindesay/flow,jgrund/flow,jgrund/flow,ylu1317/flow,jamesgpearce/flow,jamesgpearce/flow,nmote/flow,jgrund/flow,gabro/flow,ForbesLindesay/flow,gabelevi/flow,gabelevi/flow,gabro/flow,samwgoldman/flow,ylu1317/flow,MichaelDeBoey/flow,gabelevi/flow,mroch/flow,fletcherw/flow,facebook/flow,facebook/flow,mroch/flow,claudiopro/flow,fletcherw/flow,claudiopro/flow,JonathanUsername/flow,JonathanUsername/flow,JonathanUsername/flow,JonathanUsername/flow,jamesgpearce/flow,popham/flow,jamesgpearce/flow,TiddoLangerak/flow,mroch/flow,popham/flow,nmote/flow,claudiopro/flow,claudiopro/flow,gabro/flow,samwgoldman/flow,AprilArcus/flow,JonathanUsername/flow,gabelevi/flow,TiddoLangerak/flow,samwgoldman/flow,facebook/flow,AgentME/flow,nmote/flow,mroch/flow,JonathanUsername/flow