Upgrades Riak 2.0 from Beta7 to RC1

- Removes init script monkey patch required to start Beta7 and fixed in
  Beta8+
- Fixes the proxy declaration in the Vagrantfile for HTTPS endpoints
- Replaces custom packages will the packagecloud.io repos for Riak 2.0
- Bumps the module version to 2.0.0
Modifies the version to reflect the release candidate status of the
module