execdriver flag for docker daemon

  like the storage-driver flag, this implements a flag for choosing the
  execdriver to be used, defaulting to lxc.

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
docs: document some JSON parameters /containers/create and /containers/(id)/start in remote api (fixes #2948)

Docker-DCO-1.1-Signed-off-by: Manuel Woelker <github@manuel.woelker.org> (github: manuel-woelker)
Move console into execdriver
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Change Console to Terminal

Move creation and attach to driver
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Move term creation into driver
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Add CloseWriters back and do an interface cast
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Move current tty and pipe impl to lxc driver
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #4284 from crosbymichael/refactor-tty

Move tty into drivers
Merge pull request #4245 from manuel-woelker/docs-remote-api

Added some documentation for the JSON params in the /containers/create and /containers/(id)/start remote APIs
Remove Vagrantfile and remove it from all docs

This removes the Vagrantfile and updates the documentation to remove
the steps which explain how to install Docker in a VM via Vagrant.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
contrib/debootstrap: Add initial support for Tanglu

This will add support for Tanglu, a Debian based Linux-distribution.

Docker-DCO-1.1-Signed-off-by: Matthias Klumpp <matthias@tenstral.net> (github: Ximion)
Merge pull request #4246 from Ximion/master

contrib/debootstrap: Add initial support for Tanglu
Extract our default PATH value to a constant for great reuse

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Remove trailing slash from host parameter in docker init.

(This causes errors on Docker 0.8)

Docker-DCO-1.1-Signed-off-by: Morgante Pell <morgante.pell@morgante.net> (github: morgante)
Remove uneeded wording in Dockerfile format

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #4293 from cpuguy83/patch-1

Doc: Remove uneeded wording in Dockerfile format
Register built-in engine commands at runtime instead of compile-time

This allows selective loading of commands, and paves the way to dynamic
plugins.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Cleanup integration tests

Refactor integration tests to remove special cases in the creation of
test engines. All test engines are now created through newTestEngine.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Engine.ParseJob: create a new job from a shell-like text command.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #4281 from unclejack/remove_vagrantfile

Remove Vagrantfile and remove it from all docs