Refactor TestNG runner: remove TmpSuite, TestNGWrapper
Refactor TestNG runner: remove TmpSuite, TestNGWrapper

Summary:
Remove some unneeded complexity from `TestNGRunner`.
Closes https://github.com/facebook/buck/pull/1707

Reviewed By: ttsugriy

Pulled By: ttsugriy

fbshipit-source-id: f595e59

brettwooldridge/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,Addepar/buck,Addepar/buck,shs96c/buck,LegNeato/buck,SeleniumHQ/buck,SeleniumHQ/buck,rmaz/buck,SeleniumHQ/buck,romanoid/buck,LegNeato/buck,clonetwin26/buck,brettwooldridge/buck,LegNeato/buck,facebook/buck,JoelMarcey/buck,LegNeato/buck,shs96c/buck,zpao/buck,shs96c/buck,romanoid/buck,clonetwin26/buck,LegNeato/buck,brettwooldridge/buck,Addepar/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,SeleniumHQ/buck,SeleniumHQ/buck,SeleniumHQ/buck,rmaz/buck,romanoid/buck,romanoid/buck,JoelMarcey/buck,romanoid/buck,kageiit/buck,LegNeato/buck,shs96c/buck,JoelMarcey/buck,SeleniumHQ/buck,romanoid/buck,brettwooldridge/buck,clonetwin26/buck,LegNeato/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,rmaz/buck,JoelMarcey/buck,nguyentruongtho/buck,Addepar/buck,shs96c/buck,brettwooldridge/buck,clonetwin26/buck,Addepar/buck,clonetwin26/buck,SeleniumHQ/buck,SeleniumHQ/buck,LegNeato/buck,romanoid/buck,Addepar/buck,Addepar/buck,ilya-klyuchnikov/buck,zpao/buck,clonetwin26/buck,ilya-klyuchnikov/buck,romanoid/buck,rmaz/buck,clonetwin26/buck,nguyentruongtho/buck,ilya-klyuchnikov/buck,rmaz/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,kageiit/buck,clonetwin26/buck,Addepar/buck,kageiit/buck,romanoid/buck,kageiit/buck,romanoid/buck,rmaz/buck,nguyentruongtho/buck,shs96c/buck,romanoid/buck,SeleniumHQ/buck,JoelMarcey/buck,clonetwin26/buck,facebook/buck,kageiit/buck,romanoid/buck,zpao/buck,LegNeato/buck,zpao/buck,SeleniumHQ/buck,nguyentruongtho/buck,brettwooldridge/buck,JoelMarcey/buck,shs96c/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,facebook/buck,kageiit/buck,brettwooldridge/buck,facebook/buck,ilya-klyuchnikov/buck,nguyentruongtho/buck,brettwooldridge/buck,shs96c/buck,ilya-klyuchnikov/buck,shs96c/buck,LegNeato/buck,rmaz/buck,Addepar/buck,JoelMarcey/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,LegNeato/buck,shs96c/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,Addepar/buck,brettwooldridge/buck,facebook/buck,brettwooldridge/buck,LegNeato/buck,rmaz/buck,rmaz/buck,SeleniumHQ/buck,facebook/buck,brettwooldridge/buck,Addepar/buck,rmaz/buck,zpao/buck,JoelMarcey/buck,nguyentruongtho/buck,clonetwin26/buck,rmaz/buck,shs96c/buck,rmaz/buck,zpao/buck,LegNeato/buck,clonetwin26/buck,clonetwin26/buck,Addepar/buck,facebook/buck,rmaz/buck,shs96c/buck,clonetwin26/buck,zpao/buck,Addepar/buck,nguyentruongtho/buck,kageiit/buck,shs96c/buck,JoelMarcey/buck,romanoid/buck