Clean up `is_hs_intro_point`
In tor-netdir:
/// Return true if this relay is a potential HS introduction point
#[cfg(feature = "hs-service")] // TODO HSS maybe expose this unconditionally?
pub fn is_hs_intro_point(&self) -> bool {
true // TODO HSS / TODO SPEC is every relay really a potential intro point?
// TODO HSS check the stable flag?
}
This should be quite simple once we see what the right behavior is.