Pulp based forge compatibility for r10k

puppet module install {...} -v 0.0.1 AND
puppet module install {...} -v v0.0.1

behave identically for forge.puppetlabs.com

For a pulp based forge, the first works, and the second throws up.

r10k generates the second

This minor patch changes the command generated for pulp-puppetfile-forge compatibility by losing the 'v'
We've been using this for a couple of months now. A merge will move us off a fork.