bin/console-conf-wrapper: start snapd console-conf routine after user interacts
After the user has pressed enter to being using console-conf, we should invoke
the snapd routine for console-conf, which currently does the following:
* Unconditionally delays refreshes for 20 minutes from when first invoked.
* Blocks waiting for all pending refreshes to complete, including if those
involve a reboot.
This is the first step towards a more integrated user story where console-conf
is a part of the first-boot process, and at least will minimize user confusion
where console-conf proceeds asking about network configuration and then just
hangs when snapd starts a refresh as soon as network is available.