fix failing test to use kill instead of stop

TestCreateStartRestartStopStartKillRm was failing because stop has been
changed to not kill containers.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
missed a bug

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #4788 from SvenDowideit/sign-releases-fixup

Fix bugs in release.sh
Fix a lot of the sha256 and md5 stuff to be more DRY and extendible, and on more things (specifically, the tgz files too)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #4790 from tianon/fix-release

Fix a lot of the sha256 and md5 stuff to be more DRY and extendible, and on more things (specifically, the tgz files too)
Merge pull request #4782 from unclejack/fix_TestCreateStartRestartStopStartKillRm

fix failing test to use kill instead of stop