Most app installations have migrated to the new cluster-style layout
where each app is placed in a unique directory. There are now two
general issues with these observers:
We can't know when a push/sync has finished delivering all splits
for an app. Also, inotify isn't recursive, so we'd have to manage
watches for each app directory.
Change-Id: I3770fa9059ddf80f933a3804714f2e52591fce49
84e71d1d61