Revert "Don't check if network is healthy before trying to add authentication channel"

This reverts commit 7cd4344a.

api/authenticatedChannel.go

@@ -28,6 +28,11 @@ func (c *Client) RequestAuthenticatedChannel(recipient, me contact.Contact,
 	message string) error {
 	jww.INFO.Printf("RequestAuthenticatedChannel(%s)", recipient.ID)
 
+	if !c.network.GetHealthTracker().IsHealthy() {
+		return errors.New("Cannot request authenticated channel " +
+			"creation when the network is not healthy")
+	}
+
 	return auth.RequestAuth(recipient, me, message, c.rng.GetStream(),
 		c.storage, c.network)
 }