[TEST] RT-2541 Add e2e tests for changing password in Ripple Trade

What the output should look like. The warning comes from util/forms.js#L18-19
```
Using the selenium server at http://localhost:4444/wd/hub


  password setting
warning: more than one element found for locator By.cssSelector(".auth-form-container #login_password") - you may need to be more specific
warning: more than one element found for locator By.cssSelector(".auth-form-container .submit-btn-container button") - you may need to be more specific
    ✓ should render the security page 
    ✓ should render the password form 
    ✓ should change the password 
    ✓ should login with the new password 
    ✓ should render the security page again (4606ms)                                                         
    ✓ should render the password form 
    ✓ should change the password back 
```