lib: replace string concatenation with template

PR-URL: #16917
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Franziska Hinkelmann <[email protected]>

Author: subbachari

lib/_http_agent.js

@@ -127,10 +127,10 @@ Agent.prototype.getName = function getName(options) {
   // Pacify parallel/test-http-agent-getname by only appending
   // the ':' when options.family is set.
   if (options.family === 4 || options.family === 6)
-    name += ':' + options.family;
+    name += `:${options.family}`;
 
   if (options.socketPath)
-    name += ':' + options.socketPath;
+    name += `:${options.socketPath}`;
 
   return name;
 };