test: make the rest of tests path-independent

Permit spaces in paths to a Node.js executable and test scripts.

PR-URL: https://github.com/nodejs/node/pull/12972
Fixes: https://github.com/nodejs/node/issues/12773
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-http-chunk-problem.js

@@ -42,13 +42,13 @@ const filename = require('path').join(common.tmpDir, 'big');
 let server;
 
 function executeRequest(cb) {
-  cp.exec([process.execPath,
-           __filename,
+  cp.exec([`"${process.execPath}"`,
+           `"${__filename}"`,
            'request',
            server.address().port,
            '|',
-           process.execPath,
-           __filename,
+           `"${process.execPath}"`,
+           `"${__filename}"`,
            'shasum' ].join(' '),
           (err, stdout, stderr) => {
             assert.ifError(err);