Remove unused populate_links() method.
Remove unused populate_links() method.

GabrielNicolasAvellaneda/riak-python-client,basho/riak-python-client,bmess/riak-python-client,basho/riak-python-client,bmess/riak-python-client,GabrielNicolasAvellaneda/riak-python-client,basho/riak-python-client