uv: exception.code isntead of exception.errno

lib/dns_uv.js

@@ -29,7 +29,7 @@ function errnoException(errorno, syscall) {
   // Once all of Node is using this function the ErrnoException from
   // src/node.cc should be removed.
   var e = new Error(syscall + ' ' + errorno);
-  e.errno = errorno;
+  e.errno = e.code = errorno;
   e.syscall = syscall;
   return e;
 }

lib/net_uv.js

@@ -420,7 +420,7 @@ function errnoException(errorno, syscall) {
   // Once all of Node is using this function the ErrnoException from
   // src/node.cc should be removed.
   var e = new Error(syscall + ' ' + errorno);
-  e.errno = errorno;
+  e.errno = e.code = errorno;
   e.syscall = syscall;
   return e;
 }