hostapd: Create one control interface per virtual bssid

hostapd: Create one control interface per virtual bssid

Previously hostapd created one control interface /var/run/hostapd-phyX
which only contained the first virtual bssid (for example wlan0). In
order to access the other virtual bssids with hostapd_cli add all
virtual bssids to /var/run/hostapd-phyX by specifying the ctrl_interface
parameter per bssid.

Previously the control interface looked like:
	/var/run/hostapd-phyX/wlan0

Now, the control interface looks like this:
	/var/run/hostapd-phyX/wlan0
	/var/run/hostapd-phyX/wlan1
	...

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24985 3c298f89-4303-0410-b956-a3cf2f4a3e73