The RDO and CentOS Advanced Virt repositories contains
packages that should be considered hotfixes to version
found in Base repo and similar and should have priority
over them.
The yumrepo_core [1] change that was released in 1.0.7
adds the module_hotfixes parameter to yumrepo and it's
included in Puppet >= 6.15.0 which we should set to true
to make sure packages in RDO and CentOS Advanced Virt
repos is considered hotfixes upon base packages.
When we only support Puppet 7 and forward we should set
this by default for the yumrepo resources.
[1] a14c059b7d
Depends-On: https://review.opendev.org/c/792966
Change-Id: Ie747273e2ce23fadba0f3946e227ee143c1632db