Automated smoke tests depends on installed NodeJS

[aeschli]

• I ran the automated smoke test as described in Test: Automated Smoke Test #27456
• They failed with

Running tests...
npm ERR! Test failed.  See above for more details.

Running the tests with sudo showed the real problem:

/home/aeschli/workspaces/vscode/test/smoke/src/main.js:15
var testRepoLocalDir = path.join(process.cwd(), `${tempFolder}/vscode-smoketes
                                                ^
SyntaxError: Unexpected token ILLEGAL

Changing the version of the installed NodeJS to 7.5 fixed the issue

This could be fixed by avoiding ES6 syntax, or by adding a version check or by using electron run the tests.