TST: Make params explicit to calc results.
TST: Make params explicit to calc results.

Change calculate_results to take explicit parameters for sim_params, env
and benchmark_events instead of reading those values off of the TestCase
instance.

This prepares for tests setting specific sim_params in each test case,
which is needed for an incoming refactoring of how the test data is set up.

enigmampc/catalyst,ChinaQuants/zipline,otmaneJai/Zipline,humdings/zipline,Scapogo/zipline,alphaBenj/zipline,ChinaQuants/zipline,nborggren/zipline,jimgoo/zipline-fork,florentchandelier/zipline,bartosh/zipline,umuzungu/zipline,nborggren/zipline,jimgoo/zipline-fork,magne-max/zipline-ja,Scapogo/zipline,alphaBenj/zipline,wilsonkichoi/zipline,magne-max/zipline-ja,quantopian/zipline,grundgruen/zipline,humdings/zipline,otmaneJai/Zipline,dmitriz/zipline,grundgruen/zipline,bartosh/zipline,quantopian/zipline,enigmampc/catalyst,wilsonkichoi/zipline,dmitriz/zipline,florentchandelier/zipline,umuzungu/zipline