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)
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)
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