iSetDefaultVariant(sVariantName) {
					return Actions.iSetDefaultVariant.call(this, sVariantName);
				}
Sets the default for a variant.
Prerequisite is an open Manage Views dialog.
@memberof onFlVariantManagement
@public
@param {string} sVariantName The name of the new default variant
@returns {Promise} The result of the {@link sap.ui.test.Opa5#waitFor} function, to be used for chained statements