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Swap hiera_config default values for Puppet 3.x and 4.x

`$codedir` should only be used on Puppet 4, and the Puppet 3 default
should be using `$confdir`. This failed on Puppet 3 tests with:

/Puppet::Server::Config/Exec[puppet_server_config-generate_ca_cert]/returns:...

set hiera_config correctly on puppet 4

This was changed in puppet 3 vs 4:

puppet 3: https://docs.puppetlabs.com/puppet/3/reference/configuration.html#hieraconfig
puppet 4: https://docs.puppetlabs.com/puppet/latest/reference/configuration.html#hieraconfig

Add puppetserver configs

FreeBSD: puppet 3.8.x package got renamed

support newer Ubuntu versions

remove duplicate concat_basedir

Fix default systemd and cron commands with AIO package

This commit simplifies the way we manage the puppet commands,
especially the puppet cert command.

This commit removes Puppet 2.7 support as well -- it was already not
supported by the tests anymore....

modulesync: update to rspec-puppet 2.3.0, remove workarounds

modulesync: speed improvements, puppet-blacksmith 1.8.7 fix

Move reports parameter to main. Fixes #311.