Run functional devstack job on ansible collection

Porting of job that was running on patches in Ansible.

Change-Id: Ifa5a6b40d6a0f1de9f2cbc917a55c2d0e8ac421d

ci/roles/subnet/defaults/main.yml

@@ -0,0 +1,2 @@
+subnet_name: shade_subnet
+enable_subnet_dhcp: false

ci/roles/subnet/tasks/main.yml

@@ -0,0 +1,43 @@
+---
+- name: Create network {{ network_name }}
+  openstack.cloud.os_network:
+    cloud: "{{ cloud }}"
+    name: "{{ network_name }}"
+    state: present
+
+- name: Create subnet {{ subnet_name }} on network {{ network_name }}
+  openstack.cloud.os_subnet:
+    cloud: "{{ cloud }}"
+    network_name: "{{ network_name }}"
+    name: "{{ subnet_name }}"
+    state: present
+    enable_dhcp: "{{ enable_subnet_dhcp }}"
+    dns_nameservers:
+      - 8.8.8.7
+      - 8.8.8.8
+    cidr: 192.168.0.0/24
+    gateway_ip: 192.168.0.1
+    allocation_pool_start: 192.168.0.2
+    allocation_pool_end: 192.168.0.254
+
+- name: Update subnet
+  openstack.cloud.os_subnet:
+    cloud: "{{ cloud }}"
+    network_name: "{{ network_name }}"
+    name: "{{ subnet_name }}"
+    state: present
+    dns_nameservers:
+      - 8.8.8.7
+    cidr: 192.168.0.0/24
+
+- name: Delete subnet {{ subnet_name }}
+  openstack.cloud.os_subnet:
+    cloud: "{{ cloud }}"
+    name: "{{ subnet_name }}"
+    state: absent
+
+- name: Delete network {{ network_name }}
+  openstack.cloud.os_network:
+    cloud: "{{ cloud }}"
+    name: "{{ network_name }}"
+    state: absent