fix stepswitch_cnam rendering of URL to always be binary
3.09: fix to_binary_lower call
KAZOO-2317: fix compatibility between port_request and porting_manager
3.08: charge_transaction should be plural for bookkeepers
3.09: handle_channel_event/3 is called by gen_listener, violating the
expected types. Change function name to not match what gen_listener
looks for (should only call the /2 variant).
Fix: proctect modb to rollup credit more than once