Allow foreman_remote_execution 15.x

[evgeni]

No description provided.

[evgeni]

Capybara::ElementNotFound: Unable to find css "#select2-foreman_salt_salt_variable_salt_module_id-container"
    test/integration_test_helper.rb:165:in `select2'
    foreman_salt/test/integration/salt_variable_test.rb:21:in `block in <class:SaltVariableTest>'

[evgeni]

I don't exactly understand why I had to change things to select, but I am rather sure it's related to theforeman/foreman@871a647 🙈

[adamruzicka]

+1 as far as the rex dependency goes, can't really speak to select x select2

[sbernhard]

can you please rebase again @evgeni. then the failure should be gone.

[evgeni]

🍏