tests: Make wpa2_ocv_ap_group_hs more robust

Wait for hostapd to indicate connection before disconnecting from the
station side. This avoids a race condition especially with UML
time-travel.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/test_ocv.py

@@ -648,6 +648,7 @@ def test_wpa2_ocv_ap_group_hs(dev, apdev):
     conn.hapd.request("SET ext_eapol_frame_io 0")
     dev[1].connect(conn.ssid, psk=conn.passphrase, scan_freq="2412", ocv="1",
                    ieee80211w="1")
+    conn.hapd.wait_sta()
     conn.hapd.request("SET ext_eapol_frame_io 1")
 
     # Trigger a group key handshake