repl: add new line on ctrl+d

Currently the repl ends on the same line which procudes a weird
output. To prevent that, just add a new line in case of ctrl+d.

PR-URL: #26240
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

lib/repl.js

@@ -700,6 +700,11 @@ function REPLServer(prompt,
       return;
     }
     if (!self.editorMode || !self.terminal) {
+      // Before exiting, make sure to clear the line.
+      if (key.ctrl && key.name === 'd' &&
+          self.cursor === 0 && self.line.length === 0) {
+        self.clearLine();
+      }
       ttyWrite(d, key);
       return;
     }

test/parallel/test-repl-save-load.js

@@ -70,7 +70,7 @@ assert.strictEqual(fs.readFileSync(saveFileName, 'utf8'),
   putIn.run([`.save ${saveFileName}`]);
   replServer.close();
   assert.strictEqual(fs.readFileSync(saveFileName, 'utf8'),
-                     `${cmds.join('\n')}\n`);
+                     `${cmds.join('\n')}\n\n`);
 }
 
 // make sure that the REPL data is "correct"