Make some txpool logs a bit more compact (#1995)

* Improve logging for transaction pool.

* Change Debug in node-template runtime.

* Fix hexdisplay.

* Add some additional logging.

* Rebuild wasm

substrate/core/sr-primitives/src/lib.rs

@@ -661,9 +661,15 @@ macro_rules! impl_outer_log {
 /// Simple blob to hold an extrinsic without committing to its format and ensure it is serialized
 /// correctly.
 #[derive(PartialEq, Eq, Clone, Default, Encode, Decode)]
-#[cfg_attr(feature = "std", derive(Debug))]
 pub struct OpaqueExtrinsic(pub Vec<u8>);
 
+#[cfg(feature = "std")]
+impl std::fmt::Debug for OpaqueExtrinsic {
+	fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+		write!(fmt, "{}", substrate_primitives::hexdisplay::HexDisplay::from(&self.0))
+	}
+}
+
 #[cfg(feature = "std")]
 impl ::serde::Serialize for OpaqueExtrinsic {
 	fn serialize<S>(&self, seq: S) -> Result<S::Ok, S::Error> where S: ::serde::Serializer {