network/lbaas: manage or not HAproxy package

- Update fixtures and Puppetfile with last commit in
  puppet-neutron/havana
- Allow cloud::network::lbaas to manage or not HAproxy package.

With this commit, we should be able to run cloud::loadbalancer and
cloud::network::lbaas without dupplicated resource.

Bug #49
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #382 from enovance/bug/49/emilien

network/lbaas: manage or not HAproxy package