image/rm_work: Promote do_image_complete to be more sstate like

We relied on the missing do_image_complete_setscene task to ensure the dummy
sstate tarball that was created would never be used. This lead to its own
issues and a better fix for SSTATE_SKIP_CREATION has now been merged.

We can therefore make do_image_complete look like a more standard sstate
task which means image generation doesn't keep rerunning when using rm_work.

We do need to turn do_image_complete's stamp into an sstate version to
handle this (it otherwise matches the do_image_* glob).

(From OE-Core rev: 2ff9d40dc88d43567472218cf3d3faf414398c71)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image.bbclass

@@ -289,6 +289,10 @@ do_image_complete[sstate-inputdirs] = "${IMGDEPLOYDIR}"
 do_image_complete[sstate-outputdirs] = "${DEPLOY_DIR_IMAGE}"
 do_image_complete[stamp-extra-info] = "${MACHINE}"
 addtask do_image_complete after do_image before do_build
+python do_image_complete_setscene () {
+    sstate_setscene(d)
+}
+addtask do_image_complete_setscene
 
 # Add image-level QA/sanity checks to IMAGE_QA_COMMANDS
 #