Add TEST configuration file for buildbot

Add TEST configuration file for buildbot

The TEST file is provided as a hint to the automated test infra-
structure.  It controls which regression tests are run and how they
are run.  This file along with any lines in the commit messages
which start with TEST_*  are sourced by the test scripts and can
be used to override the default values.  For complete details see:

https://github.com/zfsonlinux/zfs-buildbot/

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>