Fixes #17872 - Update button label from New to Create

Based on PatternFly Terminology and Wording suggestions
Don't recommend to use New, so update New to Create.

Fixes #14067 - Host#edit integration tests should wait for tasks

When you click on Host#edit Submit button, a few orchestration tasks
will be created. After that, the show page will call (via AJAX) a few
URLS to fetch 'overview', 'resources', 'nics', etc... to fill up the...

Fixes #14097 - Only run DatabaseCleaner truncation on JS tests

Problem:
DatabaseCleaner runs after all integration tests, on truncation mode.
However, for tests where we use rack-test instead of poltergeist, this
is not necessary and slows down the test suite....