Remove all code related to sentry nodes (#8079)

* Remove all code related to sentry nodes

* More fixing

substrate/client/network/src/protocol/event.rs

@@ -92,16 +92,16 @@ pub enum Event {
 
 /// Role that the peer sent to us during the handshake, with the addition of what our local node
 /// knows about that peer.
+///
+/// > **Note**: This enum is different from the `Role` enum. The `Role` enum indicates what a
+/// >			node says about itself, while `ObservedRole` is a `Role` merged with the
+/// >			information known locally about that node.
 #[derive(Debug, Clone)]
 pub enum ObservedRole {
 	/// Full node.
 	Full,
 	/// Light node.
 	Light,
-	/// When we are a validator node, this is a sentry that protects us.
-	OurSentry,
-	/// When we are a sentry node, this is the authority we are protecting.
-	OurGuardedAuthority,
 	/// Third-party authority.
 	Authority,
 }

substrate/client/network/src/protocol/message.rs

@@ -191,7 +191,6 @@ pub mod generic {
 			match roles {
 				crate::config::Role::Full => Roles::FULL,
 				crate::config::Role::Light => Roles::LIGHT,
-				crate::config::Role::Sentry { .. } => Roles::AUTHORITY,
 				crate::config::Role::Authority { .. } => Roles::AUTHORITY,
 			}
 		}