Remove loopback mount bind

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
remove /run mountpoint

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Remove /dev tmpfs mountpoint

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Merge pull request #4457 from creack/remove_loopback_mount

Remove loopback mount
Add shm size cap to mount
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #4460 from crosbymichael/add-shm-size

Add shm size cap to mount
bump open files and procs limit via unitfile

Docker-DCO-1.1-Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com> (github: lsm5)

	modified:   contrib/init/systemd/docker.service
	modified:   contrib/init/systemd/socket-activation/docker.service
Merge pull request #4455 from lsm5/systemd

Bump container limit via systemd conf file