for want of a comma, the kingdom was lost

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Add new test-unit make rule which only runs the unit tests. Renames test
bundle to test-unit.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
beam: Add more tests to unix_test.go

These are failing, and indicate things that need to be fixed.  The
primarily problem is the lack of framing between beam messages.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
[solomon@docker.com: rebased on master]
Signed-off-by: Solomon Hykes <solomon@docker.com>
Merge branch 'pr-5353'