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: I301bb472131ba56ac05c3191fa9cddae33e999c1

CiscoSystems/puppet-neutron,IPnett/puppet-neutron,fuel-infra/puppet-neutron,CiscoSystems/puppet-neutron,openstack/puppet-neutron,IPnett/puppet-neutron,openstack/puppet-neutron,IPnett/puppet-neutron,fuel-infra/puppet-neutron,fuel-infra/puppet-neutron,CiscoSystems/puppet-neutron