SERVER-20869 adds a --seed command line argument to mongobridge and SERVER-21326 adds a --verbose command line argument to mongobridge. However, there is no simple way of configuring MongoBridge instances created by ReplSetTest and ShardingTest to pass those options to the mongobridge.

Propose adding a top-level bridgeOptions to each of the test fixture constructors as well as having a bridgeOptions field in the options for a particular node. For example:

{ bridgeOptions: { verbose: 1}, 
  nodes: {
    node0: {bridgeOptions: {seed: 10}},
    node1: {bridgeOptions: {seed: 20, verbose: 2}}
}}