inotify: pass quiet=False to inotify

1546a7d3f1f591b84c69699bcc0504dca4c465c7 changed how we handle
add_watch errors but did not pass quiet=False so that inotify would
throw exceptions instead of logging warnings.  Pass quiet=False
so that we get exceptions.

Related-to: #263
Signed-off-by: David Aguilar <davvid@gmail.com>