Add behavior property to dns response policy

.changelog/6397.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+dns: added `behavior` field to `dns_responsepolicy_rule` resource
+```

website/docs/r/dns_response_policy.html.markdown

@@ -15,13 +15,13 @@
 subcategory: "Cloud DNS"
 page_title: "Google: google_dns_response_policy"
 description: |-
-  A Response Policy is a collection of selectors that apply to queries 
+  A Response Policy is a collection of selectors that apply to queries
   made against one or more Virtual Private Cloud networks.
 ---
 
 # google\_dns\_response\_policy
 
-A Response Policy is a collection of selectors that apply to queries 
+A Response Policy is a collection of selectors that apply to queries
 made against one or more Virtual Private Cloud networks.
 
 ~> **Warning:** This resource is in beta, and should be used with the terraform-provider-google-beta provider.

website/docs/r/dns_response_policy_rule.html.markdown

@@ -111,6 +111,10 @@ The following arguments are supported:
   in particular they override private zones, the public internet, and GCP internal DNS. No SOA nor NS types are allowed.
   Structure is [documented below](#nested_local_data).
 
+* `behavior` -
+  (Optional)
+  Answer this query with a behavior rather than DNS data. Acceptable values are 'behaviorUnspecified', and 'bypassResponsePolicy'
+
 * `project` - (Optional) The ID of the project in which the resource belongs.
     If it is not provided, the provider project is used.