Added displayWhen

[ruromero]

Adapt type to support displayWhen conversion implemented here: openshift/ansible-service-broker#834

Besides, the displayGroup and displayType fields were not being testes and have been added to the schema.

Usage:

displayWhen will render the field if the condition evaluates to true. The condition can refer to a different attribute.name but it should start with _ (underscore) to allow the parser to know it is an attribute.

Example:

			{
				"name": "mediawiki_db_persistent",
				"title": "Mediawiki DB Persistent",
				"type": "boolean",
				"default": true,
				"updatable": true,
				"required": false
			},
			{
				"name": "mediawiki_db_schema",
				"title": "Mediawiki DB Schema",
				"type": "string",
				"default": "mediawiki",
				"updatable": false,
				"required": true,
				"displayWhen": "_mediawiki_db_persistent"
			}

Signed-off-by: Ruben Romero Montes rromerom@redhat.com

[shawn-hurley]

We are closing this PR and tracking the issue in openshift/ansible-service-broker#859