golint fixes for daemon/ package

- some method names were changed to have a 'Locking' suffix, as the
 downcased versions already existed, and the existing functions simply
 had locks around the already downcased version.
 - deleting unused functions
 - package comment
 - magic numbers replaced by golang constants
 - comments all over

Signed-off-by: Morgan Bauer <mbauer@us.ibm.com>

daemon/pause.go

@@ -9,7 +9,7 @@ func (daemon *Daemon) ContainerPause(name string) error {
 		return err
 	}
 
-	if err := container.Pause(); err != nil {
+	if err := container.pause(); err != nil {
 		return fmt.Errorf("Cannot pause container %s: %s", name, err)
 	}