Create SG rule for Octavia log offloading

A SG rule for Octavia log offloading (syslog on UDP 514) was
missing, and now that the security-group has been added to the
management port, it's required for receiving the amphora logs.

Change-Id: I6e0455e13a2f1351b072f11c98dfc79fecf847fb
(cherry picked from commit 4843f8b6a2)
(cherry picked from commit 7a7034462d)

tripleo_ansible/roles/octavia_overcloud_config/tasks/network.yml

@@ -101,3 +101,15 @@
     OS_USERNAME: "{{ auth_username }}"
     OS_PASSWORD: "{{ auth_password }}"
     OS_PROJECT_NAME: "{{ auth_project_name }}"
+
+- name: create security group rule for log offloading
+  openstack.cloud.security_group_rule:
+    security_group: "{{ lb_health_mgr_sec_grp_name }}"
+    protocol: udp
+    port_range_min: 514
+    port_range_max: 514
+    remote_ip_prefix: 0.0.0.0/0
+  environment:
+    OS_USERNAME: "{{ auth_username }}"
+    OS_PASSWORD: "{{ auth_password }}"
+    OS_PROJECT_NAME: "{{ auth_project_name }}"