supplicant:  Use high-priority queue for management packets.

Without this patch, wpa_supplicant EAPOL packets (at least)
are sent on normal best-effort TX queue.  I believe they
should be on the VO high-priority queue instead.

Signed-hostap: Ben Greear <greearb@candelatech.com>
hostapd:  Use high-priority queue for management packets.

Without this patch, wpa_supplicant EAPOL packets (at least)
are sent on normal best-effort TX queue when using the new
Linux tx-status-completion API.  I believe they should be on
the VO high-priority queue instead.

Signed-hostap: Ben Greear <greearb@candelatech.com>