Don't try to set unbound address when already set

The 'ip addr add' command will fail the deployment if the address has
already been set.

Change-Id: I25f04198c5cc219f8b8e23d7501bfbce62b35959
(cherry picked from commit bab1af2)

tripleo_ansible/roles/tripleo_unbound/tasks/collocated_bind.yml

@@ -44,8 +44,16 @@
     - (_public_api_interface.interface is defined) and (_public_api_interface.interface|length > 0)
   become: true
   block:
+    - name: Check if the address is already on the device.
+      shell: "ip -o addr show dev {{ _public_api_interface.interface }} | grep {{ tripleo_unbound_listen_interfaces[0] }}"
+      failed_when: false
+      register:
+        _current_addr_search
+
     - name: Set the unbound additional IPv4 address on the required device.
       command: "ip addr add {{ tripleo_unbound_listen_interfaces[0] }}/32 dev {{ _public_api_interface.interface }}"
+      when:
+        _current_addr_search.rc == 1
 
     - name: Add line to ifup-local to make sure unbound's listen IPv4 address is set on restart
       become: true
@@ -62,8 +70,17 @@
     - (_public_api_interface.interface is defined) and (_public_api_interface.interface|length > 0)
   become: true
   block:
+    - name: Check if the address is already on the device.
+      shell: "ip -o addr show dev {{ _public_api_interface.interface }} | grep {{ tripleo_unbound_listen_interfaces[0] }}"
+      failed_when: false
+      register:
+        _current_addr_search
+
     - name: Set the unbound additional IPv6 address on the required device.
       command: "ip addr add {{ tripleo_unbound_listen_interfaces[0] }}/128 dev {{ _public_api_interface.interface }}"
+      when:
+        _current_addr_search.rc == 1
+
 
     - name: Add line to ifup-local to make sure unbound's listen IPv6 address is set on restart
       become: true