Drop :undef values from haproxy config template
Drop :undef values from haproxy config template

If `undef` makes it's way into options hash it is converted to "undef" string which is certainly not what is intended, let's just treat it as actual `nil`.
gwdg/puppetlabs-haproxy,puppetlabs/puppetlabs-haproxy,fuel-infra/puppetlabs-haproxy,puppetlabs/puppetlabs-haproxy,gwdg/puppetlabs-haproxy,DavidS/puppetlabs-haproxy,puppetlabs/puppetlabs-haproxy,fuel-infra/puppetlabs-haproxy,DavidS/puppetlabs-haproxy