start the update server and attach to a running fuchsia device
usage: fx serve-updates [-v] [-l host[:port]] [--no-auto-config]
-l host:port host and port that "pm serve" will listen on
--no-auto-config do not configure this host as a package server on the device
-v verbose mode, shows info and debug messages from "pm"
-C|--clean clean the package repository first. This flag is only
valid if the incremental package publishing is enabled.
This command supports incremental package publishing. If enabled, it will
auto-publish packages as they are created or modified.
To enable incremental package serving, run "fx --enable=incremental serve-updates ..."