bsdinstall: wlanconfig: make sure the interface is up before scanning

[bz]

Summary

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

[thj]

I think starting wpa_supplicant will result in the interface being brought up, but I still think this is a good action to do explicitly.

[bz]

Yes. There were times when I was just running the script and wpa_supplicant was running already but the interface was "down" and then things failed horribly.
Unlikely to happen in the course of the normal auto install but with this shell script I am better save than sorry.

I should probably amend the commit message with the case I triggered this so it's clear as-to why?

[emaste]

I should probably amend the commit message with the case I triggered this so it's clear as-to why?

Sounds good. Maybe even as a comment before the ifconfig $WLAN_IFACE up call.

[bz]

Add comment before the ew line as suggested by @emaste.