lxd/ubuntupro: Always use inotify for watching pro configuration.

Signed-off-by: Mark Laing <mark.laing@canonical.com>

lxd/ubuntupro/client.go

@@ -177,8 +177,9 @@ func (s *Client) watch(ctx context.Context, ubuntuAdvantageDir string) error {
 		logger.Warn("Failed to read Ubunto Pro LXD configuration file", logger.Ctx{"err": err})
 	}
 
-	// Watch /var/lib/ubuntu-advantage for write, remove, and rename events.
-	monitor, err := drivers.Load(ctx, ubuntuAdvantageDir, fsmonitor.EventWrite, fsmonitor.EventRemove, fsmonitor.EventRename)
+	// Watch /var/lib/ubuntu-advantage for write, remove, and rename events. Use the inotify driver because the path is
+	// not a mountpoint.
+	monitor, err := drivers.Load(ctx, fsmonitor.DriverNameINotify, ubuntuAdvantageDir, fsmonitor.EventWrite, fsmonitor.EventRemove, fsmonitor.EventRename)
 	if err != nil {
 		return fmt.Errorf("Failed to create a file monitor: %w", err)
 	}