Add synchronization in server.Containers

This fixes races between ps and other operations
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Bump version to v1.1.0

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Fix 2 docker.com theme regressions on docs.docker.com
- Hover colours of doc nav wrong
- Primary Docs Nav not active when user is Logged in.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #6827 from SvenDowideit/docker-com-theme-regressions

Fix 2 docker.com theme regressions on docs.docker.com
Merge pull request #6818 from vieux/bump_v1.1.0

Bump v1.1.0
Merge remote-tracking branch 'origin/release'

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Change version to 1.1.0-dev

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6838 from vieux/merge_release_v1.1.0

Merge release v1.1.0
doc fix: remove trailing *

The trailing `*` makes it seem like there is some kind of annotation
Merge pull request #6842 from mrorii/patch-1

doc fix: remove trailing *
Remove dup tests

integration/server_test.go/TestCreateNumberUsername == integration-cli/docker_cli_run_test.go/TestUserByID
integration/server_test.go/TestRmi == integration-cli/docker_cli_images_test.go/TestCLIImageTagRemove

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #6801 from cpuguy83/remove_dup_run_tests

Remove dup tests
Merge pull request #6771 from LK4D4/fix_containers_list_race

Add synchronization in server.Containers