OpenStack minor update / fast-forward upgrade can fail on the controller nodes at pacemaker step with "Could not evaluate: backup_cib"

Issue

• During a stack update or upgrade the packages and containers are updated on the controller nodes and one of the step can fail with the following error message:

 "Error: /Stage[main]/Pacemaker::Stonith/Pacemaker::Property[Disable STONITH]/Pcmk_property[property--stonith-enabled]: Could not evaluate: backup_cib: Running: pcs cluster cib /var/lib/pacemaker/cib/puppet-cib-backup20191213-10-c5bsdj failed with code: 1 -> ",
        "Error: /Stage[main]/Tripleo::Profile::Pacemaker::Haproxy_bundle/Pacemaker::Property[haproxy-role-controller-21]/Pcmk_property[property-controller-21-haproxy-role]: Could not evaluate: backup_cib: Running: pcs cluster cib /var/lib/pacemaker/cib/puppet-cib-backup20191213-10-17az7xg failed with code: 1 -> ",
        "Error: /Stage[main]/Tripleo::Profile::Pacemaker::Haproxy_bundle/Pacemaker::Property[haproxy-role-controller-22]/Pcmk_property[property-controller-22-haproxy-role]: Could not evaluate: backup_cib: Running: pcs cluster cib /var/lib/pacemaker/cib/puppet-cib-backup20191213-10-1od62l1 failed with code: 1 -> ",
        "Error: /Stage[main]/Tripleo::Profile::Pacemaker::Haproxy_bundle/Pacemaker::Property[haproxy-role-controller-23]/Pcmk_property[property-controller-23-haproxy-role]: Could not evaluate: backup_cib: Running: pcs cluster cib /var/lib/pacemaker/cib/puppet-cib-backup20191213-10-hdj70n failed with code: 1 -> ",
        "Error: /Stage[main]/Tripleo::Profile::Pacemaker::Haproxy_bundle/Tripleo::Pacemaker::Haproxy_with_vip[haproxy_and_control_vip]/Pacemaker::Resource::Ip[control_vip]/Pcmk_resource[ip-1.1.1.1]: Could not evaluate: backup_cib: Running: pcs cluster cib /var/lib/pacemaker/cib/puppet-cib-backup20191213-10-gkkpz3 failed with code: 1 -> ",

PLAY RECAP *********************************************************************
controller-21            : ok=217  changed=86   unreachable=0    failed=1
controller-22            : ok=248  changed=94   unreachable=0    failed=0
controller-23            : ok=248  changed=94   unreachable=0    failed=0

Tuesday 17 December 2019  09:32:04 +0100 (0:00:01.315)       1:05:37.822 ******
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