Resolve puppet-lint reported issues.
I like to run puppet-lint against my whole code tree every so often and it flagged these items.
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Add CentOS 8 default Repos
yamllint failure on VirtuozzoLinux/7.yaml - duplication of key "gpgkey" in mapping (key-duplicates)
This is a rebase of https://github.com/voxpupuli/puppet-yum/pull/118