debash: Add solana-gossip get-rpc-url command to avoid hard coding (#5513)

core/src/gossip_service.rs

@@ -107,7 +107,7 @@ pub fn discover(
     );
     Err(std::io::Error::new(
         std::io::ErrorKind::Other,
-        "Failed to converge",
+        "Discover failed",
     ))
 }