Add generic Luigi install logic

at least try to do what we can to reduce boilerplate

rattail_fabric2/deploy/luigi/supervisor.conf.mako

@@ -0,0 +1,11 @@
+## -*- mode: conf; -*-
+
+[group:luigi]
+programs=luigid
+
+[program:luigid]
+command=${envroot}/bin/luigid --logdir ${appdir}/luigi/log --state-path ${appdir}/luigi/state.pickle --address 127.0.0.1
+directory=${appdir}/work
+environment=LUIGI_CONFIG_PATH="${appdir}/luigi/luigi.cfg"
+user=${user}
+autostart=${'true' if autostart else 'false'}