Add first pass of a riak_control authentication test.

* Verify 'none' authentication method works on previous and legacy
  releases.
* Verify 'userlist' authentication, and forced SSL requirement of the
  previous and legacy releases.
* Verify force_ssl option on current as best as we can, giving the open
  R16B02 SSL ECC bug.
Merge pull request #412 from basho/feature/csm/riak_control_authentication

Add first pass of a riak_control authentication test.