Add cpuguy83 as volumes maintainer

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
add hotfix help

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Update RELEASE-CHECKLIST with a few minor nits (periods, whitespace)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #9 from tianon/vieux-hotfix-minor-nits

Update RELEASE-CHECKLIST with a few minor nits (periods, whitespace)
Merge pull request #6570 from cpuguy83/add_cpuguy83_as_volumes_maintainer

Add cpuguy83 as volumes maintainer
Simple additions to TestBuildAddTar

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #6916 from vieux/update_release_checklist_hotfix

Add hotfix help to the release checklist
Merge pull request #6926 from LK4D4/log_for_tar_test

Simple additions to TestBuildAddTar
Remove redundant checks in runconfig.Merge

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Cleanup Cmd on ENTRYPOINT instruction

Fixes #5147
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Inherit Cmd only if no --entrypoint specified on run

Fixes #5147
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)