Update lolex to version 2

[rsimha]

This PR updates the lolex timer library used by AMP to version 2. It also fixes all instances of invalid usage of the lolex library in the unit tests.

Invalid examples

clock = lolex.install(win);
clock = lolex.install(win, 0, ['Date', 'setTimeout', 'clearTimeout']);

Valid examples

clock = lolex.install();
clock = lolex.install({toFake: ['Date', 'setTimeout', 'clearTimeout']});

Proper cleanup

clock.uninstall();

• See https://github.com/sinonjs/lolex#api-reference for examples of valid usage of lolex.install().
• See https://github.com/sinonjs/lolex#clockuninstall for a cleanup step that was missing from most AMP unit tests that use lolex.

Partial fix for #12181

[rsimha]

/to @jridgewell
/cc @dvoytenko @lannka @zhouyx @cramforce