Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix previous commit: both flags must be set.

Make sure IFM_AVALID is also set when checking ifm_status.

Submitted by: yongari

Fix a timing issue with the wired driver.

After configuring the interface, wait for the link to become active.
Many ethernet drivers reset the chip when we set multicast filters
(causing significant delays due to link re-negotiation) and, by the time
we start sending packets, they are discared instead of going to the ether.

Tested by: dumbbell

Merge hostapd / wpa_supplicant 2.0.

Reviewed by: adrian (driver_bsd + usr.sbin/wpa)

Merge wpa_supplicant and hostapd 0.7.3.

MFV hostapd & wpa_supplicant 0.6.10.

Import wpa_supplicant & hostapd 0.6.9.