overlayfs: more helpful output when not supported

based on https://github.com/docker/docker/pull/7619#discussion_r20385086

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
Upstream-commit: 3287ca1e45f74a2eac214070ccb937c7c7030a06
Component: engine

components/engine/daemon/graphdriver/overlayfs/overlayfs.go

@@ -129,6 +129,7 @@ func supportsOverlayfs() error {
 			return nil
 		}
 	}
+	log.Error("'overlayfs' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlayfs support loaded.")
 	return graphdriver.ErrNotSupported
 }