net: surface errors from setKeepAlive handle calls

Author: waterWang

lib/net.js

@@ -885,7 +885,10 @@ Socket.prototype.setKeepAlive = function(enable, initialDelayMsecs,
     this[kSetKeepAliveInitialDelay] = initialDelay;
     this[kSetKeepAliveInterval] = interval;
     this[kSetKeepAliveCount] = count;
-    this._handle.setKeepAlive(enable, initialDelay, interval, count);
+    const err = this._handle.setKeepAlive(enable, initialDelay, interval, count);
+    if (err && !isWindows) {
+      throw new ErrnoException(err, 'setKeepAlive');
+    }
   }
 
   return this;