image.bbclass: Disable shell debug messages

By default image had a "set -x" to enable shell debug messages,
this adds a lot of overhead to the system due to logging.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

meta/classes/image.bbclass

@@ -96,7 +96,7 @@ do_build[nostamp] = "1"
 # Must call real_do_rootfs() from inside here, rather than as a separate
 # task, so that we have a single fakeroot context for the whole process.
 fakeroot do_rootfs () {
-	set -x
+	#set -x
 	rm -rf ${IMAGE_ROOTFS}
 	mkdir -p ${IMAGE_ROOTFS}
 	mkdir -p ${DEPLOY_DIR_IMAGE}