[package] hostapd: introduce options to configure the logging behaviour.

[package] hostapd: introduce options to configure the logging behaviour.
The config wifi-device section gains the following settings:
	* log_level  (2)    - Defines the minimum message level
	* log_80211  (true) - Log 802.11 events
	* log_8021x  (true) - Log 802.1X events
	* log_radius (true) - Log RADIUS events
	* log_wpa    (true) - Log WPA events
	* log_driver (true) - Log driver interface messages
	* log_iapp   (true) - Log IAPP events
	* log_mlme   (true) - Log MLME events

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28056 3c298f89-4303-0410-b956-a3cf2f4a3e73