Bump openstacksdk to >1

This patch also vendors the openstack.cloud.subnet
module due to a problem with `disable_gateway_ip`
not being set for newly created subnets[1].

[1]: https://review.opendev.org/c/openstack/ansible-collections-openstack/+/940927

Change-Id: Ia021a1d7b82823c2e7498fdd66da3e2d5c6a8a79
(cherry picked from commit 8ccabb61cb8aa6a86c653cc47e43a648e8e07268)
diff --git a/roles/ironic/tasks/network/create.yml b/roles/ironic/tasks/network/create.yml
index 8032983..a459b74 100644
--- a/roles/ironic/tasks/network/create.yml
+++ b/roles/ironic/tasks/network/create.yml
@@ -25,7 +25,7 @@
 
 - name: Create bare metal network subnet
   run_once: true
-  openstack.cloud.subnet:
+  vexxhost.atmosphere.subnet:
     cloud: atmosphere
     # Subnet settings
     network_name: "{{ ironic_bare_metal_subnet_name }}"