tests: Make ap_hs20_random_mac_addr more robust

If the previuous test case used a non-RSN AP and that was left in
cfg80211 scan results, it was possible for ap_hs20_random_mac_addr to
pick that old AP from the previous test and reject to connect through
Hotspot 2.0 mechanisms. Work around this test issue by requesting new
set of scan result at the beginning of the test.

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

tests/hwsim/test_ap_hs20.py

@@ -2086,6 +2086,7 @@ def test_ap_hs20_random_mac_addr(dev, apdev):
     wpas.request("SET preassoc_mac_addr 1")
     wpas.request("SET rand_addr_lifetime 60")
     wpas.hs20_enable()
+    wpas.scan(freq="2412", only_new=True)
     id = wpas.add_cred_values({ 'realm': "example.com",
                                   'username': "hs20-test",
                                   'password': "password",
@@ -2094,7 +2095,6 @@ def test_ap_hs20_random_mac_addr(dev, apdev):
                                   'update_identifier': "1234" })
     interworking_select(wpas, bssid, "home", freq="2412")
     interworking_connect(wpas, bssid, "TTLS")
-    check_sp_type(wpas, "home")
     addr1 = wpas.get_driver_status_field("addr")
     if addr == addr1:
         raise Exception("Did not use random MAC address")