feature: add back support for puppet 3.4

Since trusty has puppet 3.4 in its package repository, we need to support it. Add it back.

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
Merge pull request #37 from TelekomLabs/puppet-34

feature: add back support for puppet 3.4
Update duritong with puppet 3.4.3 support