Concat returns a new rvalue instead of altering the existing array,
which I had mistakenly thought was it's behaviour. Using more variables
allows to join more elements together. This should fix nginx installations,
and resolve possible issues with the untested debconf options.
Installing aegir tries to use non-fpm php packages even if the
fpm package is already installed. Try to circumvent this behaviour
by passing the extra packages directly to the apt-get command as
suggested in the documentation.
@see https://aegir.readthedocs.io/en/3.x/install/#6-optional-install-with-nginx
Puppet doesn't support variable reassignment, so using concat() from
the puppetlabs/stdlib seems to be easier than making up a series of
arbitrary variable names.
Puppet removed the "+=" and "-=" operators. Replaced with $a = $a +
$b, which requires Puppet 4.x. If compatibility with 3.x is desired,
the code needs to be changed to use an external function, like concat().
Kienan Stewart