Currently, if the BroControl config (node.cfg or broctl.cfg) changes while
the interactive broctl shell is running, then a user must exit broctl
and re-run broctl in order for broctl to notice the new config.
BroControl should check if the config has changed each time a
broctl command runs, and issue a warning if it detects a change.
In addition, the "deploy" command should be smart enough to
notice this and automatically reload the configuration.