Moare fixes for parachains (#1911)

* Moare fixes for parachains

- Sending data to a job should always contain a relay parent. Done this
for the provisioner
- Fixed the `select_availability_bitfields` function. It was assuming we
have one core per validator, while we only have one core per parachain.
- Drive by async "rewrite" in proposer

* Make tests compile

* Update primitives/src/v1.rs

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

polkadot/node/subsystem/src/messages.rs

@@ -527,7 +527,7 @@ pub enum ProvisionerMessage {
 	/// where it can be assembled into the InclusionInherent.
 	RequestInherentData(Hash, oneshot::Sender<ProvisionerInherentData>),
 	/// This data should become part of a relay chain block
-	ProvisionableData(ProvisionableData),
+	ProvisionableData(Hash, ProvisionableData),
 }
 
 impl ProvisionerMessage {
@@ -536,7 +536,7 @@ impl ProvisionerMessage {
 		match self {
 			Self::RequestBlockAuthorshipData(hash, _) => Some(*hash),
 			Self::RequestInherentData(hash, _) => Some(*hash),
-			Self::ProvisionableData(_) => None,
+			Self::ProvisionableData(hash, _) => Some(*hash),
 		}
 	}
 }