Replace the activeuserservice.js with a command-line option to fingerservice.js

since activeuserservice.js was just a copy/paste of fingerservice.js to begin
with. Replace the "command" value for the ActiveUser and ActiveUser-UDP
services in ctrl/services.ini with "fingerservice.js -u".
The "?services" request now uses the portdefs.js to go through a list of known
standard TCP service ports.