recipes: Start WORKDIR -> UNPACKDIR transition

Replace references of WORKDIR with UNPACKDIR where it makes sense to do
so in preparation for changing the default value of UNPACKDIR.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-supervisor_4.2.5.bb

@@ -28,6 +28,6 @@ do_install:append() {
 	install -d ${D}${sysconfdir}/supervisor
 	install -d ${D}${systemd_system_unitdir}
 
-	install -m 0644 ${WORKDIR}/supervisord.conf ${D}${sysconfdir}/supervisor
-	install -m 0644 ${WORKDIR}/supervisor.service ${D}${systemd_system_unitdir}
+	install -m 0644 ${UNPACKDIR}/supervisord.conf ${D}${sysconfdir}/supervisor
+	install -m 0644 ${UNPACKDIR}/supervisor.service ${D}${systemd_system_unitdir}
 }