[AutoPR frontdoor/resource-manager] Update FrontDoor WAF API with new preview features (2019-03-01)#1666

AutorestCI wants to merge 1 commit intorestapi_auto_frontdoor/resource-managerAzure/azure-sdk-for-js:restapi_auto_frontdoor/resource-managerfrom

restapi_auto_5437Azure/azure-sdk-for-js:restapi_auto_5437Copy head branch name to clipboard