Description of problem:
When creating a dialog field, one can specify a validation method. Currently only regex is supported. It would be great to call an automate method. An example: create a 'vm_name' field and check the name is available.
Version-Release number of selected component (if applicable): 5.6.1
How reproducible: Always
Steps to Reproduce:
1. Create a dialog field in a custom dialog
Actual results: One can only select regex as validation method
Expected results: One can select an automate method (instance)