add default-relative-commit for arc
add default-relative-commit for arc

This avoids having arc prompt for it during the CI run :-/

hanhailong/watchman,twitter/watchman,montogeek/watchman,webmasteraxe/watchman,besarthoxhaj/watchman,sdgdsffdsfff/watchman,sdgdsffdsfff/watchman,supriyantomaftuh/watchman,sdgdsffdsfff/watchman,besarthoxhaj/watchman,phmx/watchman,hanhailong/watchman,alanwill/watchman,yun63/watchman,amasad/watchman,Jonekee/watchman,amasad/watchman,dcolascione/laptop-watchman,michalliu/watchman,bhamiltoncx/watchman,facebook/watchman,dcolascione/laptop-watchman,amasad/watchman,kevinsawicki/watchman,yonglehou/watchman,hanhailong/watchman,Jonekee/watchman,bhamiltoncx/watchman,webmasteraxe/watchman,michalliu/watchman,hanhailong/watchman,twitter/watchman,wez/watchman,amasad/watchman,masoncloud/watchman,dhruvsinghal/watchman,wez/watchman,dhruvsinghal/watchman,twitter/watchman,dcolascione/laptop-watchman,webmasteraxe/watchman,webmasteraxe/watchman,montogeek/watchman,yonglehou/watchman,Ziriax/watchman,masoncloud/watchman,montogeek/watchman,yun63/watchman,nodakai/watchman,kwlzn/watchman,yun63/watchman,facebook/watchman,hanhailong/watchman,webmasteraxe/watchman,bitemyapp/watchman,besarthoxhaj/watchman,bitemyapp/watchman,dhruvsinghal/watchman,facebook/watchman,michalliu/watchman,besarthoxhaj/watchman,windofthesky/watchman,yangeagle/watchman,Ziriax/watchman,phmx/watchman,yangeagle/watchman,amasad/watchman,bhamiltoncx/watchman,yangeagle/watchman,kwlzn/watchman,sdgdsffdsfff/watchman,supriyantomaftuh/watchman,hanhailong/watchman,dcolascione/laptop-watchman,nodakai/watchman,dhruvsinghal/watchman,kwlzn/watchman,sdgdsffdsfff/watchman,facebook/watchman,sdgdsffdsfff/watchman,montogeek/watchman,kevinsawicki/watchman,nodakai/watchman,sdgdsffdsfff/watchman,bitemyapp/watchman,alanwill/watchman,windofthesky/watchman,yun63/watchman,sdgdsffdsfff/watchman,twitter/watchman,windofthesky/watchman,yonglehou/watchman,twitter/watchman,wez/watchman,exponentjs/watchman,facebook/watchman,supriyantomaftuh/watchman,facebook/watchman,yangeagle/watchman,montogeek/watchman,montogeek/watchman,supriyantomaftuh/watchman,masoncloud/watchman,yonglehou/watchman,nodakai/watchman,amasad/watchman,kevinsawicki/watchman,kwlzn/watchman,twitter/watchman,supriyantomaftuh/watchman,yonglehou/watchman,yonglehou/watchman,hanhailong/watchman,bitemyapp/watchman,kwlzn/watchman,montogeek/watchman,besarthoxhaj/watchman,alanwill/watchman,webmasteraxe/watchman,windofthesky/watchman,alanwill/watchman,Jonekee/watchman,Jonekee/watchman,Jonekee/watchman,bhamiltoncx/watchman,yonglehou/watchman,kevinsawicki/watchman,bitemyapp/watchman,facebook/watchman,dcolascione/laptop-watchman,dcolascione/laptop-watchman,windofthesky/watchman,dcolascione/laptop-watchman,kwlzn/watchman,windofthesky/watchman,kevinsawicki/watchman,kwlzn/watchman,bhamiltoncx/watchman,phmx/watchman,facebook/watchman,nodakai/watchman,bhamiltoncx/watchman,supriyantomaftuh/watchman,Ziriax/watchman,alanwill/watchman,phmx/watchman,exponentjs/watchman,phmx/watchman,yun63/watchman,alanwill/watchman,masoncloud/watchman,dhruvsinghal/watchman,yun63/watchman,masoncloud/watchman,masoncloud/watchman,wez/watchman,wez/watchman,bitemyapp/watchman,dhruvsinghal/watchman,Jonekee/watchman,wez/watchman,dhruvsinghal/watchman,michalliu/watchman,michalliu/watchman,facebook/watchman,exponentjs/watchman,yangeagle/watchman,twitter/watchman,phmx/watchman,masoncloud/watchman,amasad/watchman,kevinsawicki/watchman,nodakai/watchman,exponentjs/watchman,besarthoxhaj/watchman,yonglehou/watchman,nodakai/watchman,windofthesky/watchman,kevinsawicki/watchman,amasad/watchman,Ziriax/watchman,dhruvsinghal/watchman,Jonekee/watchman,bitemyapp/watchman,besarthoxhaj/watchman,exponentjs/watchman,wez/watchman,bitemyapp/watchman,wez/watchman,Jonekee/watchman,wez/watchman,twitter/watchman,yangeagle/watchman,webmasteraxe/watchman,exponentjs/watchman,webmasteraxe/watchman,masoncloud/watchman,Ziriax/watchman,yun63/watchman,nodakai/watchman,michalliu/watchman,michalliu/watchman,michalliu/watchman,nodakai/watchman,supriyantomaftuh/watchman,Ziriax/watchman,montogeek/watchman,supriyantomaftuh/watchman,yun63/watchman,dcolascione/laptop-watchman,yangeagle/watchman,besarthoxhaj/watchman,hanhailong/watchman