cluster_info removal

Remove cluster info from the release and applications stuff.
Remove the call from riak-admin.

This change also relies upon:
https://github.com/basho/riak_kv/pull/393
https://github.com/basho/riak_search/pull/130
https://github.com/basho/riak_core/pull/226
https://github.com/basho/riak_pipe/pull/54