Gemfile: rely on puppet-openstack_spec_helper for dependencies
Gemfile: rely on puppet-openstack_spec_helper for dependencies

Rely on puppet-openstack_spec_helper gemspec file for managing Gems
dependencies

Change-Id: I0b1d3c9bf1b327690e975f30e1faf6edc533bce9

openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca