Add ability to force removal of running container via docker rm -f

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #3959 from cpuguy83/3958_add_ability_to_remove_running_container_in_single_command

Add ability to force removal of running container via docker rm -f