Add tests for cloud account creation over the UI

[elyezer]

As a Integrade QE, I want tests that ensure the cloud account creation wizard is working properly.

Acceptance Criteria

• Verify that there is a test that ensure the happy path. The created user account can be fetched using the API for assertions for now. The happy path can be seen here https://user-images.githubusercontent.com/3761375/42388402-67910128-8113-11e8-97d9-ec01bf285226.gif
• Verify that there are tests or assertions to check for error messages when leaving the required fields blank. Current required fields are account name and ARN.
• Verify that there are tests or assertions to check for the minimum and maximum value length.
  • For the Account Name it should have at least 3 and at maximum 256 characters. The maximum is ensured by the the input field maxlenght attribute.
  • The ARN expects a value following this format arn:aws:iam::123456789012:role/Cloud-Meter-role
• Verify that there are tests or assertions to check if the back button will save the status, if the previous input values will remain the same when coming back.
• Verify that there are tests or assertions to check if the Cancel button will actually cancel the account creation and the wizard will be dismissed.

Assumptions and Questions

• The above tests should be done using a regular user. The superuser should have a similar behavior.