ifconfig: 80211, add assoc parameter

[enweiwu]

Summary

Below is the planned commit:

We often use wpa_supplicant(8) to initiate a sta to auth/assoc an ap. I bring simple (without key) 802.11 auth/assoc intilization into ifconfig(8). in this patch.

[lwhsu]

sbin/ifconfig/ifieee80211.c

897

Sneaked white space here.

[cy]

Will there be a man page update for this at some point?

[enweiwu]

In D36242#823477, @cy wrote:

Will there be a man page update for this at some point?

Sure! I'm going to do this.

[enweiwu]

This patch is no longer needed since I'm trying to use wpa_supplicant(8) on wtap(4). See D38508.