add systemd MAINTAINERS file

	new file:   contrib/init/systemd/MAINTAINERS

Docker-DCO-1.1-Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org> (github: lsm5)
use systemd socket-activation by default

	modified:   contrib/init/systemd/docker.service
	renamed:    contrib/init/systemd/socket-activation/docker.socket -> contrib/init/systemd/docker.socket
	deleted:    contrib/init/systemd/socket-activation/docker.service

Docker-DCO-1.1-Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org> (github: lsm5)
systemd unitfile requires docker.socket

	modified:   contrib/init/systemd/docker.service

Docker-DCO-1.1-Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org> (github: lsm5)
removed default --rm option from example build command

this line gave the false impression that containers are not removed
unless you specify the --rm argument.
Merge pull request #7021 from lsm5/systemd-maintainer

Add systemd MAINTAINERS file and update docker.service to always use socket activation
Merge pull request #7049 from albers/default-option

removed default --rm option from example build command
Change switch to if so that the break statements correctly breaks loop

Docker-DCO-1.1-Signed-off-by: Kohei Tsuruta <coheyxyz@gmail.com> (github: coheyxyz)
Merge pull request #7055 from coheyxyz/break-loop

Break loop correctly