make sure unix sockets are tagged correctly

lib/net.js

@@ -215,6 +215,10 @@ Stream.prototype.open = function (fd, type) {
 
   setImplmentationMethods(this);
 
+  if (this.type === "unix") {
+    this._writeWatcher.isUnixSocket = true;
+  }
+
   this._writeWatcher.set(this.fd, false, true);
   this.writable = true;
 };
@@ -520,6 +524,7 @@ Stream.prototype.destroy = function (exception) {
     this._writeWatcher.socket = null;
     this._writeWatcher.firstBucket = null;
     this._writeWatcher.lastBucket = null;
+    this._writeWatcher.isUnixSocket = false;
     ioWatchers.free(this._writeWatcher);
     this._writeWatcher = null;
   }

src/node_io_watcher.cc

@@ -557,6 +557,4 @@ void IOWatcher::Dump() {
 }
 
 
-
-
 }  // namespace node