Install python-swiftclient as cinder-backup dependency (SOC-11364)

As a workaround for SOC-10522, explicitly install python-swiftclient
on CND-BCK nodes as part of setting up the cinder-backup service.

This avoids a race condition where cinder-backup is started prior to
the Monasca Agent dependencies being installed on the node which may
not happen until after the cinder-backup start is attempted.

Change-Id: I3073bd76e3166ba68ba5b9d94ee928586127de4f

Author: Fergal Mc Carthy

roles/CND-BCK/tasks/install.yml

@@ -20,6 +20,16 @@
 
 - include: ../../CND-VOL/tasks/install.yml cnd_stop_tgt="False"
 
+# TODO(fergal): Remove once the fix for SOC-10522 has landed
+# The cinder-backup services depends on the switfclient module
+# but that module is currently missing from the Cinder venv.
+- name: CND-BCK | install | Install cinder-backup dependencies
+  package:
+    name: "{{ item }}"
+    state: present
+  with_items:
+    - python-swiftclient
+
 - name: CND-BCK | install | Update venv cache
   install_package:
     cache: update