(MODULES-10780) PA 6 to PA 7 upgrade tests

[Dorin-Pleava]

This PR tests the upgradability to puppet 7 using the
puppetlabs-puppet_agent module.

Currently it uses the puppet 7 nightly builds, as a puppet7 collection
does not exist.

[puppetcla]

CLA signed by all contributors.

[ciprianbadescu]

Could we keep one test and just set different *_source based on platform?

[Dorin-Pleava]

@ciprianbadescu I thought it could work, but that manifest is generated on the master node, and it only knows about the OS of the master. I am trying to create a manifest that has this logic, but don't think the syntax allows for something like this.

$source = case $facts['os']['name'] {
    /^(Debian|Ubuntu)$/: { "apt_source => 'http://nightlies.puppet.com/apt'" }
    /^(Redhat|CentOS|Fedora)$/: { "yum_source => 'http://nightlies.puppet.com/yum'" }
}

class { puppet_agent:
  package_version => '7.0.0.224.gaf2034af',
  $source,
  collection      => 'puppet7-nightly'
}

[gimmyxd]

The first digit should be 7 i guess, to make sure that the upgrade succeed.