Comment 4 for bug 1835615

We are seeing this issue again on fs020 master promotion job:
https://logs.rdoproject.org/openstack-periodic-master/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-7-ovb-3ctlr_1comp-featureset001-master/e72fe9b/logs/undercloud/home/zuul/overcloud_deploy.log.txt.gz#_2019-08-12_21_46_58

"+ puppet apply --verbose --detailed-exitcodes --summarize --color=false --modulepath /etc/puppet/modules:/opt/stack/puppet-modules:/usr/share/openstack-puppet/modules --tags file,file_line,concat,augeas,pacemaker::resource::bundle,pacemaker::property,pacemaker::resource::ocf,pacemaker::constraint::order,pacemaker::constraint::colocation,rabbitmq_policy,rabbitmq_user,rabbitmq_ready -e 'noop_resource('\\''package'\\''); include ::tripleo::profile::base::pacemaker;include ::tripleo::profile::pacemaker::rabbitmq_bundle'",
2019-08-12 21:46:58 | "Warning: Support for ruby version 2.0.0 is deprecated and will be removed in a future release. See https://puppet.com/docs/puppet/latest/system_requirements.html for a list of supported ruby versions.",
2019-08-12 21:46:58 | " (location: /usr/share/ruby/vendor_ruby/puppet.rb:130:in `<module:Puppet>')",
2019-08-12 21:46:58 | "Error: Facter: error while resolving custom fact \"rabbitmq_nodename\": undefined method `[]' for nil:NilClass",