don't try allocating a port to upload a docs release to s3

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
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)
Signed-off-by: Solomon Hykes <solomon@docker.com>