Add vlan tag and subnet candidates to Interconnect Attachments. (#166)

Signed-off-by: Modular Magician <magic-modules@google.com>

plugins/modules/gcp_compute_interconnect_attachment_facts.py

@@ -140,6 +140,22 @@ items:
         which cannot be a dash.
       returned: success
       type: str
+    candidateSubnets:
+      description:
+      - Up to 16 candidate prefixes that can be used to restrict the allocation of
+        cloudRouterIpAddress and customerRouterIpAddress for this attachment.
+      - All prefixes must be within link-local address space (169.254.0.0/16) and
+        must be /29 or shorter (/28, /27, etc). Google will attempt to select an unused
+        /29 from the supplied candidate prefix(es). The request will fail if all possible
+        /29s are in use on Google's edge. If not supplied, Google will randomly select
+        an unused /29 from all of link-local space.
+      returned: success
+      type: list
+    vlanTag8021q:
+      description:
+      - The IEEE 802.1Q VLAN tag for this attachment, in the range 2-4094.
+      returned: success
+      type: int
     region:
       description:
       - Region where the regional interconnect attachment resides.