Merge pull request #6140 from zanedeg/patch-1

Updated link to new docker-node-hello repository
Adding User Guide

* Added User Guide section outlines.
* Added User Guide to menu.
* Moved HTTPS example to articles.
* Replaced Hello World example with User Guide.
* Moved use cases out of examples.
* Updated Introduction to add User Guide.
* Redirected migrated /use and /articles links.
* Added Docker.io section
* Added Dockerized section
* Added Using Docker section
* Added Docker Images section
* Added Docker Links section
* Added Docker Volumes section

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Changed the term rename to alias etc.

Docker-DCO-1.1-Signed-off-by: William Henry <whenry@redhat.com> (github: ipbabble)

 Changes to be committed:
	modified:   contrib/man/md/docker-tag.1.md
pkg/testutils: utility functions to facilitate writing Go tests

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
pkg: mflag: flag: make mflag strip quotes in -flag="var" forms

This patch improves the mflag package to ensure that things arguments
to mflag such as `-flag="var"` or `-flag='var'` have the quotes
stripped from the value (to mirror the getopt functionality for similar
flags).

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
pkg: mflag: flag: added tests for quote-stripped flags

This patch adds some tests to ensure that quoted flags are properly
handled by the mflag package.

Docker-DCO-1.1-Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
Adding "stats" and "spec" option to nsinit binary which will print the stats and spec respectively.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Adding percpu usage to cgroup stats reported by libcontainer.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Add Cristian as maintainer to pkg/testutils

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Fix format in maintainers files

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #6154 from SvenDowideit/pr_out_adding_user_guide

Adding User Guide
Update networking.md

grammar

Docker-DCO-1.1-Signed-off-by: Andre Dublin <81dublin@gmail.com> (github: andredublin)

rebased by

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Remove unused and racy "used" param from streamformatter

Also tests written
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #6157 from SvenDowideit/pr_out_update_networking_md

Update networking.md
aws json is not javascript style json. trailing comma breaks it :(

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
resume pulling the layer on disconnect

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6116 from vishh/nsinit_stats

Adding "stats" and "spec" option to nsinit CLI
Update cpu stat test for no error
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #6150 from LK4D4/remove_used_from_streamformatter

Remove unused and racy "used" param from streamformatter
Merge pull request #6130 from vieux/standardize_api_keys

Standardize api keys to CamelCase