rtbkit_integration_test: make use of a configurable number of agents
"toPopupTransfer" -> "topupTransfer" and reworked indentation
rtbkit_integration_test: cleanup of the code handling multiple agents/accounts
rtbkit_integration_test: improved support for HTTP application layer
slave banker: added some metrics for the account sync
slave_banker: removed comments
rtbkit_integration_test: use static_pointer_cast<T> when casting a Banker to a SlaveBanker
rtbkit_integration_test: use ZMQ_APP_LAYER, since it fits the first scope of the test and enables it to pass
rtbkit_integration_test: reduced number of accounts to 50, to lower pressure on our test machine