Ensure we wait long enough for Riak Control to start.

Wait until both the Riak Control gen_server has been registered, and the
webmachine routes have been added to the dispatcher to ensure that Riak
Control is able to service requests to prevent races between the test,
and application initialization.
Merge pull request #420 from basho/bugfix/csm/riak-control-races

Ensure we wait long enough for Riak Control to start.