Ensure that selinux is disabled by default

This also includes some portability changes so that the package can be
imported with the top level runtime.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

daemonconfig/config.go

@@ -28,6 +28,7 @@ type Config struct {
 	ExecDriver                  string
 	Mtu                         int
 	DisableNetwork              bool
+	EnableSelinuxSupport        bool
 }
 
 // ConfigFromJob creates and returns a new DaemonConfig object
@@ -45,6 +46,7 @@ func ConfigFromJob(job *engine.Job) *Config {
 		InterContainerCommunication: job.GetenvBool("InterContainerCommunication"),
 		GraphDriver:                 job.Getenv("GraphDriver"),
 		ExecDriver:                  job.Getenv("ExecDriver"),
+		EnableSelinuxSupport:        false, // FIXME: hardcoded default to disable selinux for .10 release
 	}
 	if dns := job.GetenvList("Dns"); dns != nil {
 		config.Dns = dns