test: move more tests from sequential to parallel

Only `test-stdin-from-file.js` has been modified so that the `stdin.txt`
is written in a temp directory instead of the `fixtures` directory.

PR-URL: https://github.com/nodejs/node/pull/6187
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-stdin-from-file.js

@@ -6,7 +6,7 @@ var childProcess = require('child_process');
 var fs = require('fs');
 
 var stdoutScript = join(common.fixturesDir, 'echo-close-check.js');
-var tmpFile = join(common.fixturesDir, 'stdin.txt');
+var tmpFile = join(common.tmpDir, 'stdin.txt');
 
 var cmd = '"' + process.argv[0] + '" "' + stdoutScript + '" < "' +
           tmpFile + '"';
@@ -24,6 +24,8 @@ var string = 'abc\nümlaut.\nsomething else\n' +
              '有效的改善了岭南地区落后的政治、##济现状。\n';
 
 
+common.refreshTmpDir();
+
 console.log(cmd + '\n\n');
 
 try {