Remove seed option from JSON in 2-random-choices algorithm
Remove seed option from JSON in 2-random-choices algorithm

Summary:
Remove json option to seed random number generator for two-random-choices
algorithm.

Reviewed By: andreazevedo

Differential Revision: D7282297

fbshipit-source-id: f494b5c00ac1d35f3970f3b803c93957baf327da

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter