Remove lock around JsonRpcRequestProcessor (#10417)

automerge

core/src/cluster_info.rs

@@ -253,6 +253,12 @@ pub struct ClusterInfo {
     start_time: u64,
 }
 
+impl Default for ClusterInfo {
+    fn default() -> Self {
+        Self::new_with_invalid_keypair(ContactInfo::default())
+    }
+}
+
 #[derive(Default, Clone)]
 pub struct Locality {
     /// The bounds of the neighborhood represented by this locality