Don't kill by pid for other drivers

Closes #4575
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Have the exec driver and kernel version in non-debug mode in `docker info`

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Merge pull request #4633 from crosbymichael/no-pid-kill

Don't kill by pid for other drivers
Merge pull request #4659 from creack/more_info

Have the exec driver and kernel version in non-debug mode in `docker info`