UTIL: Add a generic inotify module Adds a reusable module for watching files using the Linux-specific inotify(7) interface. Adds the possibility to watch the file's parent directory as well to make it possible to watch moves into the directory and allow watching file that doesn't exist at the time the watch is created. This interface is needed to implement the files provider, so this commit is related to: https://fedorahosted.org/sssd/ticket/2228 Reviewed-by: Pavel Březina <pbrezina@redhat.com>