Do not require python3 package
Do not require python3 package

In CentOS 7 there is no such package, and in Fedora it is required
by mock anyway, so it will get installed.

javierpena/puppet-delorean,javierpena/puppet-delorean,rdo-infra/puppet-dlrn,javierpena/puppet-delorean,rdo-infra/puppet-dlrn,rdo-infra/puppet-dlrn