Merge pull request #4566 from srid/nsinit_uniq_errors

nsinit: prefix errors with their source
Move signal to pkg

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Create portable signalMap

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Make docker use the signal pkg with strings

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Merge pull request #4515 from vieux/improve_sort_flags

improve alpha sort in mflag
Merge pull request #4567 from creack/merge_auth_registry

Merge auth package within registry
Merge pull request #4520 from tianon/clarify-docs-branch-update

Clarify how to update the docs branch in the RELEASE-CHECKLIST with concrete instructions
Merge pull request #4563 from creack/signal-improvment

Signal improvments
move git clone from daemon to client

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

add a little doc
if client has no git, use server

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
spelling correction

s/singal/signal/

Docker-DCO-1.1-Signed-off-by: Dolph Mathews <dolph.mathews@gmail.com> (github: dolph)
Update email + add self to pkg/signal

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Fix init script cgroup mounting workarounds to be more similar to cgroupfs-mount and thus work properly

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Add variable for DOCKER_LOGFILE to sysvinit and use append instead of overwrite in opening the logfile

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
add Net::Docker CPAN module

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #4577 from SvenDowideit/moltar-perl-modules

add Net::Docker CPAN module
Like signal_linux.go, we don't have import os and os/signal

Docker-DCO-1.1-Signed-off-by: Kato Kazuyoshi <kato.kazuyoshi@gmail.com> (github: kzys)
Move execdriver construction into execdriver/execdrivers

This can't be in execdriver (dependency loop) but should not be
hardcoded inside runtime.go either. So we put it in a subpackage.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Merge pull request #4583 from kzys/freebsd-signal

Like signal_linux.go, we don't have import os and os/signal
Merge pull request #4569 from dolph/master

spelling correction