Broken master

1. https://gitlab.com/gitlab-org/gitlab-ee/builds/17993132

Offenses:

app/controllers/projects/mirrors_controller.rb:20:38: C: Style/PreferredHashMethods: Use Hash#key? instead of Hash#has_key?.
    elsif project.previous_changes.has_key?('mirror')

2. https://gitlab.com/gitlab-org/gitlab-ee/builds/17993075

      undefined local variable or method `wait_for_ajax' for #<RSpec::ExampleGroups::ProjectedTags::AccessControl::WhenCreatingAProtectedTag:0x000000238c15e0>