Add comments to many functions

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

libcontainer/utils/utils.go

@@ -6,6 +6,8 @@ import (
 	"io"
 )
 
+// GenerateRandomName returns a new name joined with a prefix.  This size
+// specified is used to truncate the randomly generated value
 func GenerateRandomName(prefix string, size int) (string, error) {
 	id := make([]byte, 32)
 	if _, err := io.ReadFull(rand.Reader, id); err != nil {