Major Description
We currently run the mesos-slave with --image_provisioner_backend=copy inside the Vagrant vm. This can result in task launch failures due to slow copies as documented in https://issues.apache.org/jira/browse/MESOS-6004. We currently work around these failures by launching the mesos-slave with --executor_registration_timeout=1mins, but it would be better to use a more performant means of provisioning tasks' images. One option is to flatten e2e test images and try --image_provisioner_backend=bind. Another is to investigate the storage drive used by the docker daemon running in the Vagrant vm and switch it out for a more performant driver if one can be found.