Rename created bucket-types to be prefixed with 'pytest', fix PEP8
Rename created bucket-types to be prefixed with 'pytest', fix PEP8

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