Data-Driven create params and validate_credentials

[agrare]

Add a data-driven-forms params_for_create allowing dynamic API driven
UI form building and add the standard validate_credentials API.

[agrare]

@borod108 we're working on allowing the API to drive what the UI forms required to add a provider requires. Can you review this to check that I have what is required/optional and the types correct for raw_connect?
cc @skateman

[borod108]

@agrare this is a cool change :)
We do need to have RSA key pair creds as well.
(They were add here: ManageIQ/manageiq-ui-classic#3983)

[agrare]

Thanks @borod108, is this another endpoint or just another authentication type?

[borod108]

@agrare just an authentication type as far as I understand.

[agrare]

Okay @borod108 added PTAL

[miq-bot]

Checked commits agrare/manageiq-providers-ovirt@6b824a4~...a6bd6b7 with ruby 2.4.6, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 0 offenses detected
Everything looks fine. 👍

[borod108]

LGTM