shell set wlan country < ssid, dhcp waits on supplicant. fixes resolv

From: Julian H. Stacey <jhs_at_berklix.com>
Date: Fri, 25 Jul 2025 08:18:51 UTC
Hi freebsd-wireless@, freebsd-net@
This a repost as I sent to non existant mobile@ should have been wireless@.

http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/jhs/etc/wlan_action
Solves problems I've had, See `Purposes:' & `Limitations:' Comments Welcome.

Cheers,
- -- 
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