hostapd: Fix wlan interfaces not UP/RUNNING

Like wpa_supplicant, hostapd does not automatically UP the interface
when configured. The fix is similar to 5fcdc19a81.

Reported by:	avg
Tested by:	avg
MFC after:	1 week

libexec/rc/rc.d/hostapd

@@ -12,6 +12,13 @@
 name="hostapd"
 desc="Authenticator for IEEE 802.11 networks"
 command=${hostapd_program}
+start_postcmd="hostapd_poststart"
+
+hostapd_poststart() {
+	ifconfig ${ifn} down
+	sleep 2
+	ifconfig ${ifn} up
+}
 
 ifn="$2"
 if [ -z "$ifn" ]; then