upgrade librarian-puppet script

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add default Puppetfile

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
restore default puppetfile, now as symlink

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
update librarian script

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>