tools: Notifier code cleanup

Removes unused attribute log in NotificationProperties.
Removes unused attribute pidFile in EngineMonitorService.
Removes unnecessary @SuppressWarning in Notifier.
Reformats code in Notifier.

Change-Id: I0ddf6dbb01baa0e3fd1a8349f26aead0cd6a5fde
Signed-off-by: Martin Perina <mperina@redhat.com>