[specfile] fix postinstall and preuninstall scripts
[specfile] fix postinstall and preuninstall scripts

Summary:
If watchman wasn't already running, the postinstall and preuninstall scripts
would fail.

Test Plan: No obvious way to test this.

Reviewers: wez

Differential Revision: https://phabricator.fb.com/D1009042

Task ID: 2825133

--HG--
extra : amend_source : 1a94bd3f150c728eed524b23c5ab2679ab6ff4c8

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