[#1814] Mark - Refactoring cucumber tests:

- Replacing calls to steps from other steps with calls to helper classes.
[#1814] Mark - Page model for child list page:

in the capybara tests.
[#1814] Mark - More capybara test improvements:

- Device list page.
- Child record toolbar widget.
Merge pull request #608 from zoodor/1814_removing_step_to_step_calls

More work for #1814 to improve capybara test readability/maintainability