Unknown variable warnings in puppetserver.log

[7yl4r]

I am using this module in its simplest form:

	class{ '::libvirt': }  # thias-libvirt

My puppet master log shows these warnings:

[admin@puppetmaster ~]# grep libvirt /var/log/puppetlabs/puppetserver/puppetserver.log
2018-04-18 15:42:16,353 WARN  [...] [puppetserver] Puppet Unknown variable: '::libvirt::params::auth_unix_rw'. at /etc/puppetlabs/code/environments/production/modules/libvirt/manifests/init.pp:48:32
2018-04-18 15:42:16,356 WARN  [...] [puppetserver] Puppet Unknown variable: '::libvirt::params::unix_sock_dir'. at /etc/puppetlabs/code/environments/production/modules/libvirt/manifests/init.pp:49:32

env info:

[admin@puppetmaster ~]# puppet --version
4.10.0
[admin@puppetmaster ~]# cat /etc/*elease | head -n 1
CentOS Linux release 7.3.1611 (Core)