Allow upgrade tasks to run when looping through steps

Currently for non controller upgrades we're looping through the
upgrade steps and run the upgrade tasks based on when conditionals
including the step number and the existing upgrade task condition.
Some of tasks fail because the variables used in when conditionals
are not available through all steps. This change adds default values
to these vars where possible or creates them for all steps to avoid
failures.

Related-Bug: 1708115
Change-Id: I5c731043cec8e31fc82ca98972a301baa7294c4f

docker/services/iscsid.yaml

@@ -109,7 +109,7 @@ outputs:
         - name: Stop and disable iscsid service
           tags: step2
           service: name=iscsid state=stopped enabled=no
-          when: stat_iscsid_service.stat.exists
+          when: (stat_iscsid_service.stat|default('')).exists|default(false)
         - name: stat /lib/systemd/system/iscsid.socket
           tags: step2
           stat: path=/lib/systemd/system/iscsid.socket
@@ -117,4 +117,4 @@ outputs:
         - name: Stop and disable iscsid.socket service
           tags: step2
           service: name=iscsid.socket state=stopped enabled=no
-          when: stat_iscsid_socket.stat.exists
+          when: (stat_iscsid_socket.stat|default('')).exists|default(false)

puppet/services/openvswitch.yaml

@@ -179,6 +179,6 @@ outputs:
               with_items:
                 - "{{ovs_list_of_rpms.stdout_lines}}"
           tags: step2
-          when: "'2.5.0-14' in '{{ovs_version.stdout}}'
+          when: "'2.5.0-14' in ovs_version.stdout|default('')
                 or
-                ovs_packaging_issue|succeeded"
+                ovs_packaging_issue|default(false)|succeeded"