Added parallel test runner to distribution.
Added parallel test runner to distribution.

This commit add the parallel test runner to the distributed files.

Review: https://reviews.apache.org/r/59730/

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