test: remove blank lines at end of files

In preparation for a lint rule that disallows empty lines at the end of
a file, remove such lines from a number of test files.

Refs: #8918
PR-URL: #8920
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: Trott

test/debugger/test-debugger-repl-utf8.js

@@ -4,4 +4,3 @@ var script = common.fixturesDir + '/breakpoints_utf8.js';
 process.env.NODE_DEBUGGER_TEST_SCRIPT = script;
 
 require('./test-debugger-repl.js');
-

test/gc/test-http-client-onerror.js

@@ -76,4 +76,3 @@ function status() {
     process.exit(0);
   }
 }
-

test/known_issues/test-stdout-buffer-flush-on-exit.js

@@ -23,5 +23,3 @@ if (process.argv[2] === 'child') {
 
   assert.strictEqual(stdout, longLine, `failed with exponent ${exponent}`);
 });
-
-

test/message/2100bytes.js

@@ -45,4 +45,3 @@ console.log([
   '_____________________________________________2050',
   '_____________________________________________2100'
 ].join('\n'));
-

test/parallel/test-domain-stack-empty-in-process-uncaughtexception.js

@@ -19,4 +19,3 @@ process.on('beforeExit', common.mustCall(function onBeforeExit() {
 d.run(function() {
   throw new Error('boom');
 });
-

test/parallel/test-eval-require.js

@@ -10,4 +10,3 @@ var child = spawn(process.execPath, ['-e', 'require("foo")'], options);
 child.on('exit', function(code) {
   assert.equal(code, 0);
 });
-

test/parallel/test-event-emitter-special-event-names.js

@@ -33,4 +33,3 @@ process.on('__proto__', common.mustCall(function(val) {
   assert.strictEqual(val, 1);
 }));
 process.emit('__proto__', 1);
-

test/parallel/test-fs-chmod.js

@@ -135,4 +135,3 @@ process.on('exit', function() {
   assert.equal(0, openCount);
   assert.equal(false, got_error);
 });
-

test/parallel/test-http-client-abort2.js

@@ -14,4 +14,3 @@ server.listen(0, function() {
     });
   });
 });
-

test/parallel/test-http-client-race-2.js

@@ -95,4 +95,3 @@ process.on('exit', function() {
   assert.equal(body2_s, body2);
   assert.equal(body3_s, body3);
 });
-