Migrate polkadot-primitives to v6 (#1543)

- Async-backing related primitives are stable `primitives::v6`
- Async-backing API is now part of `api_version(7)`
- It's enabled on Rococo and Westend runtimes

---------

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

polkadot/node/network/protocol/src/peer_set.rs

@@ -118,16 +118,9 @@ impl PeerSet {
 	/// Networking layer relies on `get_main_version()` being the version
 	/// of the main protocol name reported by [`PeerSetProtocolNames::get_main_name()`].
 	pub fn get_main_version(self) -> ProtocolVersion {
-		#[cfg(not(feature = "network-protocol-staging"))]
 		match self {
-			PeerSet::Validation => ValidationVersion::V1.into(),
-			PeerSet::Collation => CollationVersion::V1.into(),
-		}
-
-		#[cfg(feature = "network-protocol-staging")]
-		match self {
-			PeerSet::Validation => ValidationVersion::VStaging.into(),
-			PeerSet::Collation => CollationVersion::VStaging.into(),
+			PeerSet::Validation => ValidationVersion::V2.into(),
+			PeerSet::Collation => CollationVersion::V2.into(),
 		}
 	}
 
@@ -152,7 +145,7 @@ impl PeerSet {
 			PeerSet::Validation =>
 				if version == ValidationVersion::V1.into() {
 					Some("validation/1")
-				} else if version == ValidationVersion::VStaging.into() {
+				} else if version == ValidationVersion::V2.into() {
 					Some("validation/2")
 				} else {
 					None
@@ -160,7 +153,7 @@ impl PeerSet {
 			PeerSet::Collation =>
 				if version == CollationVersion::V1.into() {
 					Some("collation/1")
-				} else if version == CollationVersion::VStaging.into() {
+				} else if version == CollationVersion::V2.into() {
 					Some("collation/2")
 				} else {
 					None
@@ -223,8 +216,8 @@ impl From<ProtocolVersion> for u32 {
 pub enum ValidationVersion {
 	/// The first version.
 	V1 = 1,
-	/// The staging version.
-	VStaging = 2,
+	/// The second version.
+	V2 = 2,
 }
 
 /// Supported collation protocol versions. Only versions defined here must be used in the codebase.
@@ -232,8 +225,8 @@ pub enum ValidationVersion {
 pub enum CollationVersion {
 	/// The first version.
 	V1 = 1,
-	/// The staging version.
-	VStaging = 2,
+	/// The second version.
+	V2 = 2,
 }
 
 /// Marker indicating the version is unknown.