(maint) Remove 'master' from the version string
(maint) Remove 'master' from the version string

This was added to help create a 'latest' stream for some perf testing
jobs. We have better ways of tracking 'latest' now, so this commit
removes the extra string, which was confusing version bump automation.

puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver