pkg/testutils: utility functions to facilitate writing Go tests

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
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)
Added note in manpages to clarify effect of docker start on started container

When run on a container that is already running, docker always succeeds.
This was an intentional change in v0.10; it previously caused an error.
This commit clarifies the man pages to indicate this is intended behavior.

Docker-DCO-1.1-Signed-off-by: Matthew Heon <mheon@redhat.com> (github: mheon)
Initial links for Docker Hub rename

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Fixes broken ssh server example

Docker-DCO-1.1-Signed-off-by: cpuguy83 <cpuguy83@gmail.com> (github: cpuguy83)
Clarify effect of docker start on started container in CLI docs

This behavior changed from v0.9 to v0.10, so document it to prevent
any confusion.

Docker-DCO-1.1-Signed-off-by: Matthew Heon <mheon@redhat.com> (github: mheon)
only forward auth to trusted locations

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6220 from vieux/fix_redirect

Only forward auth to trusted locations
Merge pull request #6156 from jamtur01/links

Initial link update for Docs
Revert "Initial links for Docker Hub rename"

This reverts commit 2819677c215bd409b4ce4da51f0ddfb303760796.

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #6223 from jamtur01/rl

Revert "Initial links for Docker Hub rename"
Initial copy edits to home page.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: SvenDowideit)
reflow to 80 columns

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #6222 from SvenDowideit/pr_out_reflow_to_80_columns

Initial edits to home page
Merge pull request #6219 from cpuguy83/fix_ssh_example_docs_root_login

Fixes broken ssh server example
Merge pull request #6182 from mheon/fix_manpage_issue

Clarify manpages on docker start
Merge pull request #6145 from shykes/pr_out_pkg_testutils_utility_functions_to_facilitate_writing_go_tests

pkg/testutils: utility functions to facilitate writing Go tests