puppet-neutron: $overlay_ip_version should be converted to string for 'in' operator

[Feng Pan]

In neutron::plugins::ml2 class, if parameter overlay_ip_version is passed in through hiera with an integer value (4 or 6), we see the following error:

    Error: '6' from left operand of 'in' expression is not a string at /etc/puppet/modules/neutron/manifests/plugins/ml2.pp:176 on node overcloud-controller-0.opnfvlf.org

The variable overlay_ip_version should be converted to string in the following line for the 'in' operator:
 if !is_service_default($overlay_ip_version) and !($overlay_ip_version in [4, 6]) {

[Feng Pan (fpan-c)]

Fix committed to master: https://review.openstack.org/#/c/465640/

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/puppet-neutron 11.1.0 release.