Add new script to generate AUTHORS and regenerate AUTHORS (fixing a few new dups too)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
archive: add unclejack to MAINTAINERS

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
allow sigquit to display stacktrace in debug mode

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #7227 from tianon/generate-authors

Add new script to generate AUTHORS and regenerate AUTHORS (fixing a few new dups too)
Merge pull request #7231 from vieux/allow_stack_trace

allow sigquit to display stacktrace in debug mode
Merge pull request #7166 from unclejack/maintainer_archive

archive: add unclejack to MAINTAINERS
Adding nsinit to docker binary. This is required for supporting runin in docker.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Create a copy of the docker binary called nsinit for the purposes of supporting RunIn docker.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)