test: move some test from sequential to parallel

The only test with modifications is `test-stdin-child-proc` that was
passing when it should not because the exit code of the child process
was not being checked.

PR-URL: https://github.com/nodejs/node/pull/6087
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Claudio Rodriguez <cjrodr@yahoo.com>

test/sequential/test-regress-GH-1899.js → test/parallel/test-regress-GH-1899.js

@@ -17,4 +17,3 @@ child.on('exit', function(code, signal) {
   assert.equal(code, 0);
   assert.equal(output, 'hello, world!\n');
 });
-

test/sequential/test-regress-GH-746.js → test/parallel/test-regress-GH-746.js

@@ -27,4 +27,3 @@ server.listen(common.PORT, function() {
 process.on('exit', function() {
   assert.ok(accepted);
 });
-

test/parallel/test-stdin-child-proc.js

@@ -0,0 +1,13 @@
+'use strict';
+// This tests that pausing and resuming stdin does not hang and timeout
+// when done in a child process.  See test/parallel/test-stdin-pause-resume.js
+const common = require('../common');
+const assert = require('assert');
+const child_process = require('child_process');
+const path = require('path');
+const cp = child_process.spawn(process.execPath,
+                    [path.resolve(__dirname, 'test-stdin-pause-resume.js')]);
+
+cp.on('exit', common.mustCall((code) => {
+  assert.equal(code, 0);
+}));

test/sequential/test-stdin-pipe-resume.js → test/parallel/test-stdin-pipe-resume.js

@@ -25,4 +25,3 @@ if (process.argv[2] === 'child') {
     child.stdin.end();
   }, 10);
 }
-

test/sequential/test-zerolengthbufferbug.js → test/parallel/test-zerolengthbufferbug.js

@@ -34,4 +34,3 @@ process.on('exit', function() {
   assert.ok(gotResponse);
   assert.equal(0, resBodySize);
 });
-

test/sequential/test-stdin-child-proc.js

@@ -1,8 +0,0 @@
-'use strict';
-// This tests that pausing and resuming stdin does not hang and timeout
-// when done in a child process.  See test/simple/test-stdin-pause-resume.js
-require('../common');
-var child_process = require('child_process');
-var path = require('path');
-child_process.spawn(process.execPath,
-                    [path.resolve(__dirname, 'test-stdin-pause-resume.js')]);