(SERVER-1898) Update version for 2.8.0 release
(SERVER-1898) Update version for 2.8.0 release

This commit will automatically trigger CI to build packages for 2.8.0

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