Use GNU tail for -F.
Add prestart script for zfs test run.

This just installs a built nightly.
Remove now unnecessary comment.
Add hooks for running the ZFS test suite.

Modify the Vagrantfile to add 5 1GB disks to a SCSI controller on the VM.

Add a "run" script that gets run from the vagrant host.  This plays the role
of puppet master.  It snapshots the VM, installs and reboots into the
nightly's BE, runs the ZFS test suite, and rolls back the VM afterwards.

Add an "actual" script that gets run inside the VM.  This calls the actual
ZFS test suite and copies the results to the /vagrant/zfstests subdirectory
that contains the overall results.