Remove -o cli flag and DriverConfig from HostConfig

Because we are still working on the UI for plugins we want to make sure anything new that is introduced to docker works with the plan going ahead.  We are currently remove the -o flag for the UI so that it cannot be used.  This disables selinux, systemd units/slices, and configuration for the native driver right now.  These will all be supported once we approve the final UI for this flag and the plugin api.  


Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)