remove dockerscript

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Update contrib/mkimage/debootstrap to remove /var/lib/apt/lists (trimming at least 40MB and forcing "apt-get update" in dependent images before packages can be installed)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Add bash completion for "docker rm -f" and complete on all containers instead of just stopped containers when "-f" is specified

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Anglicanisms: Grammatical correction (pos. adj. apost.)

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Merge pull request #6690 from tianon/remove-apt-lists

Update contrib/mkimage/debootstrap to remove /var/lib/apt/lists
Merge pull request #6640 from ostezer/commands.go-linguistics-1

docker help -> grammatical correction (pos. adj. apost.)
Merge pull request #6693 from tianon/bash-complete-force-rm

Add bash completion for "docker rm -f" and complete on all containers instead of just stopped containers when "-f" is specified
Merge pull request #6625 from vieux/remove_dockerscript

remove dockerscript