Removed dependency on external Docker image for mesos-tidy.
Removed dependency on external Docker image for mesos-tidy.

In order minimize external dependency, this patch modifies the
implementation of `support/mesos-tidy.sh` to build the mesos-tidy
Docker container on the fly just before executing tests.

We follow the same basic idea already employed in
`support/docker_build.sh` where the image is built, executed, and
removed. Note that this approach likely does not take full advantage
of Docker's caching capabilities.

Review: https://reviews.apache.org/r/51650/

reneploetz/mesos,Gilbert88/mesos,gsantovena/mesos,zmalik/mesos,asamerh4/mesos,kaysoky/mesos,neilconway/mesos,asamerh4/mesos,dforsyth/mesos,kaysoky/mesos,asamerh4/mesos,kaysoky/mesos,reneploetz/mesos,neilconway/mesos,yuquanshan/customizedMesos,asamerh4/mesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,asamerh4/mesos,asamerh4/mesos,reneploetz/mesos,Gilbert88/mesos,reneploetz/mesos,craimbert/mesos,abudnik/mesos,chhsia0/mesos,abudnik/mesos,yuquanshan/customizedMesos,neilconway/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,neilconway/mesos,dforsyth/mesos,craimbert/mesos,andschwa/mesos,jpeach/mesos,jpeach/mesos,kaysoky/mesos,gsantovena/mesos,craimbert/mesos,neilconway/mesos,reneploetz/mesos,andschwa/mesos,chhsia0/mesos,zmalik/mesos,abudnik/mesos,andschwa/mesos,verizonlabs/mesos,abudnik/mesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,dforsyth/mesos,reneploetz/mesos,zmalik/mesos,gsantovena/mesos,kaysoky/mesos,yuquanshan/customizedMesos,kaysoky/mesos,jpeach/mesos,chhsia0/mesos,chhsia0/mesos,Gilbert88/mesos,abudnik/mesos,dforsyth/mesos,zmalik/mesos,chhsia0/mesos,verizonlabs/mesos,dforsyth/mesos,reneploetz/mesos,zmalik/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,Gilbert88/mesos,craimbert/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,andschwa/mesos,jpeach/mesos,andschwa/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,gsantovena/mesos,abudnik/mesos,andschwa/mesos,verizonlabs/mesos,abudnik/mesos,yuquanshan/customizedMesos,craimbert/mesos,neilconway/mesos,zmalik/mesos,dforsyth/mesos,chhsia0/mesos,gsantovena/mesos,asamerh4/mesos,dforsyth/mesos,craimbert/mesos,gsantovena/mesos,yuquanshan/customizedMesos,jpeach/mesos,chhsia0/mesos,craimbert/mesos,verizonlabs/mesos,zmalik/mesos,verizonlabs/mesos,andschwa/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,jpeach/mesos