/bin/wifi: report association result for Quantenna.

Change-Id: I7e104b1a769a9f88136118a8743a26e93463439b
(cherry picked from commit e47ea10108fea5effb95439c4853ff6af3e10e5b)
diff --git a/wifi/quantenna.py b/wifi/quantenna.py
index 10af967..b88ccac 100755
--- a/wifi/quantenna.py
+++ b/wifi/quantenna.py
@@ -99,6 +99,13 @@
     # 'apply_security_config' must be called instead.
     _qcsapi('apply_security_config', 'wifi0')
 
+    for _ in xrange(10):
+      if _qcsapi('get_status', 'wifi0') == 'Up':
+        break
+      time.sleep(1)
+    else:
+      raise utils.BinWifiException('wpa_supplicant failed to connect')
+
   return True