-Use peer to refer to mininodes instead of node
because they are not bitcoind nodes.
-Use log.debug for logs that give helpful but
not super necessary information.
-Adhere to style guidelines (newlines, capitalization).
-A node with bloomfilters disabled should disconnect peers that send
msg_mempool, msg_filterload, or msg_filteradd.
-Renamed the test because it now has a wider scope and msg_mempool's
actual functionality makes more sense for p2p_filter.py.
