Intermittent tooltip unit test failures

Created by: cvrebert

See screencast for https://saucelabs.com/tests/0d25c466ec544ce5b76a1248ddb1d6f5 Relevant test: https://github.com/twbs/bootstrap/blob/b2385016ecfc0cbd2059a595c66726236a7bc91f/js/tests/unit/tooltip.js#L662 We probably need to increase the duration/timeouts to account for emulated iOS Safari being slower than desktop browsers.