Array/Hash mutating operations deprecated

Puppet 3.5.0 will deprecate mutating arrays and hashes, as found here (from the Apache 2.4 merge): https://github.com/puppetlabs/puppetlabs-apache/blob/e8348ff5/manifests/vhost.pp#L419-L424

This leads to warnings while running Puppet:

    The use of mutating operations on Array/Hash is deprecated at /usr/share/foreman-installer/modules/apache/manifests/vhost.pp:422. See http://links.puppetlabs.com/puppet-mutation-deprecation

More info: https://tickets.puppetlabs.com/browse/PUP-864