Engine: optional Logging field to disable custom logging in engine.

* The default behavior is preserved
* This disables the use of the `TEST` environment variable in engine.

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Fix unmount when host volume is removed

Fixes #5244
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Fixing typos

Docker-DCO-1.1-Signed-off-by: Dan McPherson <dmcphers@redhat.com> (github: danmcp)
Add missing "ps" requirement to PACKAGERS.md

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Replacing ASCII art image with real diagram

Docker-DCO-1.1-Signed-off-by: Aaron Huslage <huslage@gmail.com> (github: huslage)
Merge pull request #5215 from danmcp/fix_typos

Fixing typos
Merge pull request #5246 from crosbymichael/fix-mount

Fix unmount when host volume is removed
provide more information when TestTop tests fail

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Add "validate" Makefile target

This was supposed to be part of my previous PR, but somehow got missed.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
simplify the docs branch process for now

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5248 from unclejack/more_info_testtop

provide more information when TestTop tests fail
Merge pull request #5230 from huslage/master

Replacing ASCII art image with real diagram
Fix for TOC "click/expand" & "scroll position" problem on mobile.

Fixes:

 - Click/expand
 - Scroll pos.
 - TOC table scroll-down arrow.
 - TOC title scrolls to top.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Remove manually written TOCs from archived docs.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Fix for broken in-document links which got scrambled during conversion.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
change inode map to struct from bool

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Fix & improvements for mobile (& desktop) menu & submenu behaviour & issues.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Improve (&restructure) Docker Index docs on the Docker docs.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Rename runtime/* to daemon/*

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Amendments providing the "Edit on GitHub" link for docs on master.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)