calling the overlay build functions direclty

The warewulfd process called `wwctl build -O [system|runtime] node`
if autobuild was set. This created [system|runtime].img which isn't
supported with the build model. Calling now BuildOverlay directly

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/overlay/overlay.go

@@ -19,26 +19,6 @@ import (
 	"github.com/pkg/errors"
 )
 
-/*
-
-func BuildSystemOverlay(nodeList []node.NodeInfo) error {
-	return nil
-}
-
-func BuildRuntimeOverlay(nodeList []node.NodeInfo) error {
-	return nil
-}
-
-
-func FindSystemOverlays() ([]string, error) {
-	return findAllOverlays("system")
-}
-
-func FindRuntimeOverlays() ([]string, error) {
-	return findAllOverlays("runtime")
-}
-*/
-
 /*
 Build all overlays (runtime and generic) for a node
 */