WIP: Add interconnect attachments. (hashicorp#1569)

Fixes hashicorp#1140.

docs/r/compute_interconnect_attachment.html.markdown

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+---
+# ----------------------------------------------------------------------------
+#
+#     ***     AUTO GENERATED CODE    ***    AUTO GENERATED CODE     ***
+#
+# ----------------------------------------------------------------------------
+#
+#     This file is automatically generated by Magic Modules and manual
+#     changes will be clobbered when the file is regenerated.
+#
+#     Please read more about how to change this file in
+#     .github/CONTRIBUTING.md.
+#
+# ----------------------------------------------------------------------------
+layout: "google"
+page_title: "Google: google_compute_interconnect_attachment"
+sidebar_current: "docs-google-compute-interconnect-attachment"
+description: |-
+  Represents an InterconnectAttachment (VLAN attachment) resource.
+---
+
+# google\_compute\_interconnect\_attachment
+
+Represents an InterconnectAttachment (VLAN attachment) resource. For more
+information, see Creating VLAN Attachments.
+
+
+## Example Usage
+
+```hcl
+resource "google_compute_router" "foobar" {
+  name    = "my-router"
+  network = "${google_compute_network.foobar.name}"
+}
+
+resource "google_compute_interconnect_attachment" "default" {
+  name         = "test-interconnect"
+  interconnect = "my-interconnect-id"
+  router       = "${google_compute_router.foobar.self_link}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+
+* `interconnect` -
+  (Required)
+  URL of the underlying Interconnect object that this attachment's traffic will
+  traverse through.
+
+* `router` -
+  (Required)
+  URL of the cloud router to be used for dynamic routing. This router must be in
+  the same region as this InterconnectAttachment. The InterconnectAttachment will
+  automatically connect the Interconnect to the network & region within which the
+  Cloud Router is configured.
+
+* `name` -
+  (Required)
+  Name of the resource. Provided by the client when the resource is created. The
+  name must be 1-63 characters long, and comply with RFC1035. Specifically, the
+  name must be 1-63 characters long and match the regular expression
+  `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a
+  lowercase letter, and all following characters must be a dash, lowercase
+  letter, or digit, except the last character, which cannot be a dash.
+
+
+- - -
+
+
+* `description` -
+  (Optional)
+  An optional description of this resource.
+
+* `region` -
+  (Optional)
+  Region where the regional interconnect attachment resides.
+* `project` - (Optional) The ID of the project in which the resource belongs.
+    If it is not provided, the provider project is used.
+
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are exported:
+
+
+* `cloud_router_ip_address` -
+  IPv4 address + prefix length to be configured on Cloud Router
+  Interface for this interconnect attachment.
+
+* `customer_router_ip_address` -
+  IPv4 address + prefix length to be configured on the customer
+  router subinterface for this interconnect attachment.
+
+* `private_interconnect_info` -
+  Information specific to an InterconnectAttachment. This property
+  is populated if the interconnect that this is attached to is of type DEDICATED.  Structure is documented below.
+
+* `google_reference_id` -
+  Google reference ID, to be used when raising support tickets with
+  Google or otherwise to debug backend connectivity issues.
+
+* `creation_timestamp` -
+  Creation timestamp in RFC3339 text format.
+* `self_link` - The URI of the created resource.
+
+
+The `private_interconnect_info` block contains:
+
+* `tag8021q` -
+  802.1q encapsulation tag to be used for traffic between
+  Google and the customer, going to and from this network and region.
+
+## Timeouts
+
+This resource provides the following
+[Timeouts](/docs/configuration/resources.html#timeouts) configuration options:
+
+- `create` - Default is 4 minutes.
+- `delete` - Default is 4 minutes.
+
+## Import
+
+InterconnectAttachment can be imported using any of these accepted formats:
+
+```
+$ terraform import google_compute_interconnect_attachment.default projects/{{project}}/regions/{{region}}/interconnectAttachments/{{name}}
+$ terraform import google_compute_interconnect_attachment.default {{project}}/{{region}}/{{name}}
+$ terraform import google_compute_interconnect_attachment.default {{name}}
+```