Remove legacy network protocol (#8296)

substrate/client/network/src/protocol/generic_proto/upgrade.rs

@@ -15,13 +15,8 @@
 
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
+
 pub use self::collec::UpgradeCollec;
-pub use self::legacy::{
-	RegisteredProtocol,
-	RegisteredProtocolEvent,
-	RegisteredProtocolName,
-	RegisteredProtocolSubstream
-};
 pub use self::notifications::{
 	NotificationsIn,
 	NotificationsInSubstream,
@@ -32,5 +27,4 @@ pub use self::notifications::{
 };
 
 mod collec;
-mod legacy;
 mod notifications;