Do not track files generated by stout autotools build setup.
Do not track files generated by stout autotools build setup.

Review: https://reviews.apache.org/r/61063/

Gilbert88/mesos,andschwa/mesos,dforsyth/mesos,andschwa/mesos,kaysoky/mesos,Gilbert88/mesos,zmalik/mesos,verizonlabs/mesos,andschwa/mesos,dforsyth/mesos,chhsia0/mesos,Gilbert88/mesos,abudnik/mesos,jpeach/mesos,verizonlabs/mesos,zmalik/mesos,jpeach/mesos,verizonlabs/mesos,gsantovena/mesos,asamerh4/mesos,verizonlabs/mesos,chhsia0/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,jpeach/mesos,verizonlabs/mesos,dforsyth/mesos,asamerh4/mesos,Gilbert88/mesos,dforsyth/mesos,dforsyth/mesos,Gilbert88/mesos,asamerh4/mesos,zmalik/mesos,jpeach/mesos,kaysoky/mesos,abudnik/mesos,chhsia0/mesos,abudnik/mesos,abudnik/mesos,verizonlabs/mesos,reneploetz/mesos,zmalik/mesos,dforsyth/mesos,verizonlabs/mesos,reneploetz/mesos,kaysoky/mesos,jpeach/mesos,chhsia0/mesos,andschwa/mesos,asamerh4/mesos,gsantovena/mesos,gsantovena/mesos,Gilbert88/mesos,zmalik/mesos,andschwa/mesos,zmalik/mesos,chhsia0/mesos,andschwa/mesos,reneploetz/mesos,asamerh4/mesos,andschwa/mesos,abudnik/mesos,abudnik/mesos,gsantovena/mesos,zmalik/mesos,gsantovena/mesos,reneploetz/mesos,gsantovena/mesos,dforsyth/mesos,abudnik/mesos,kaysoky/mesos,reneploetz/mesos,asamerh4/mesos,reneploetz/mesos,jpeach/mesos,asamerh4/mesos,kaysoky/mesos,jpeach/mesos,kaysoky/mesos,reneploetz/mesos,gsantovena/mesos,chhsia0/mesos