[engine] skip hanging multiprocess engine tests
Review Request #3941 — Created May 27, 2016 and submitted
|ity, kwlzn, patricklaw, stuhood|
https://travis-ci.org/peiyuwang/pants/jobs/133499909 still hangs even with
https://rbcommons.com/s/twitter/r/3940/ significantly reduces lmdb usage.
So #3510 is really frequent, have to disable these tests until we figure out
the root cause.
https://travis-ci.org/peiyuwang/pants/builds/133512820 is running