Simplify Vagrantfile and add platforms
Simplify Vagrantfile and add platforms

Add multiple Linux distros, switch to using vagrant cloud for image
source, switch to using vagrant-auto_network for ip address assignment,
and remove puppet provisioner.

The purpose of these changes is to convert the Vagrantfile to a simple
development environment for the module, rather than providing demo
functionality.

Cornellio/puppet-riak,al4/puppet-riak,SPBTV/puppet-riak,Cornellio/puppet-riak,basho-labs/puppet-riak,DevOpsFu/puppet-riak,GabrielNicolasAvellaneda/puppet-riak,al4/puppet-riak,DevOpsFu/puppet-riak,GabrielNicolasAvellaneda/puppet-riak,DevOpsFu/puppet-riak,GabrielNicolasAvellaneda/puppet-riak,SPBTV/puppet-riak,SPBTV/puppet-riak,basho-labs/puppet-riak,Cornellio/puppet-riak,al4/puppet-riak,basho-labs/puppet-riak