Upgrade of puppet-tripleo yields: "Error: Invalid parameter memcache_servers on Class[Swift::Objectexpirer] at /etc/puppet/modules/tripleo/manifests/profile/base/swift/proxy.pp:80" in Red Hat OpenStack Platform 10

Issue

Upgrade of puppet-tripleo yields: Error: Invalid parameter memcache_servers on Class[Swift::Objectexpirer] at /etc/puppet/modules/tripleo/manifests/profile/base/swift/proxy.pp:80 in Red Hat OpenStack Platform 10.

This happens after a point update of puppet-tripleo to a version >= puppet-tripleo-5.6.4-2.el7ost.

Below is the difference in ..swift/proxy.pp with and without this patch:

Without patch (successful stack update):

 include ::swift::objectexpirer

With patch (stack fail)-

 class { '::swift::objectexpirer':
 memcache_servers => $swift_memcache_servers
 }

After applying this patch, the next stack update fails with error:

    Error: Invalid parameter memcache_servers on Class[Swift::Objectexpirer] at /etc/puppet/modules/tripleo/manifests/profile/base/swift/proxy.pp:80 on node