Add new data source: google_dns_managed_zone (hashicorp#268)

Author: rosbo

docs/d/dns_managed_zone.html.markdown

@@ -0,0 +1,49 @@
+---
+layout: "google"
+page_title: "Google: google_dns_managed_zone"
+sidebar_current: "docs-google-datasource-dns-managed-zone"
+description: |-
+  Provides access to the attributes of a zone within Google Cloud DNS
+---
+
+# google\_dns\_managed\_zone
+
+Provides access to a zone's attributes within Google Cloud DNS.
+For more information see
+[the official documentation](https://cloud.google.com/dns/zones/)
+and
+[API](https://cloud.google.com/dns/api/v1/managedZones).
+
+```hcl
+data "google_dns_managed_zone" "env_dns_zone" {
+  name        = "qa-zone"
+}
+
+resource "google_dns_record_set" "dns" {
+  name = "my-address.${data.google_dns_managed_zone.env_dns_zone.dns_name}"
+  type = "TXT"
+  ttl  = 300
+
+  managed_zone = "${data.google_dns_managed_zone.env_dns_zone.name}"
+
+  rrdatas = ["test"]
+}
+```
+
+## Argument Reference
+
+* `name` - (Required) A unique name for the resource.
+
+* `project` - (Optional) ID of the project for the Google Cloud DNS zone.
+
+## Attributes Reference
+
+The following attributes are exported:
+
+* `dns_name` - The DNS name of this zone, e.g. "terraform.io".
+
+* `description` - A textual description field.
+
+* `name_servers` - The list of nameservers that will be authoritative for this
+    domain. Use NS records to redirect from your DNS provider to these names,
+    thus making Google Cloud DNS authoritative for this zone.

docs/r/dns_managed_zone.markdown

@@ -8,7 +8,8 @@ description: |-
 
 # google\_dns\_managed_zone
 
-Manages a zone within Google Cloud DNS.
+Manages a zone within Google Cloud DNS. For more information see [the official documentation](https://cloud.google.com/dns/zones/) and
+[API](https://cloud.google.com/dns/api/v1/managedZones).
 
 ## Example Usage
 

google.erb

@@ -25,6 +25,9 @@
       <li<%= sidebar_current("docs-google-datasource-container-versions") %>>
       <a href="/docs/providers/google/d/google_container_engine_versions.html">google_container_engine_versions</a>
       </li>
+      <li<%= sidebar_current("docs-google-datasource-dns-managed-zone") %>>
+      <a href="/docs/providers/google/d/dns_managed_zone.html">dns_managed_zone</a>
+      </li>
       <li<%= sidebar_current("docs-google-datasource-iam-policy") %>>
       <a href="/docs/providers/google/d/google_iam_policy.html">google_iam_policy</a>
       </li>