beaker: stop listing modules for debug

When deploying Puppet4, puppet binary is not in the regular PATH so we
need some logic to export /opt/puppetlabs/bin when running Puppet4.
We already have this logic in puppet-openstack-integration when
deploying modules with install_modules.sh script, that is used in
beaker_spec_helper, and we already list modules for debug purpose, so we
don't need to do it again here.

Change-Id: I744faa1d0abb8820439d3a92e863e1c631e4ab87

lib/puppet-openstack_spec_helper/beaker_spec_helper.rb

@@ -60,9 +60,6 @@ RSpec.configure do |c|
       puppet_module_install(:source => proj_root, :module_name => module_name)
 
       on host, "rm -fr #{repo}"
-
-      # List modules installed to help with debugging
-      on host, puppet('module','list'), { :acceptable_exit_codes => 0 }
     end
   end
 end