contractcourt: add verbose logging in resolvers

We now put the outpoint in the resolvers's logging so it's easier to
debug.

contractcourt/contract_resolver.go

@@ -120,8 +120,10 @@ func newContractResolverKit(cfg ResolverConfig) *contractResolverKit {
 }
 
 // initLogger initializes the resolver-specific logger.
-func (r *contractResolverKit) initLogger(resolver ContractResolver) {
-	logPrefix := fmt.Sprintf("%T(%v):", resolver, r.ChanPoint)
+func (r *contractResolverKit) initLogger(prefix string) {
+	logPrefix := fmt.Sprintf("ChannelArbitrator(%v): %s:", r.ChanPoint,
+		prefix)
+
 	r.log = log.WithPrefix(logPrefix)
 }