WifiNetworkRequest: clear events after 1st request

Bug: 179802076
Test: act.py -c test_station_3/tests/google/wifi/config.json -tb
chromeos1-dev-test-station-3 -tc WifiNetworkRequestTest

Change-Id: Ie41e47af57af9f9956cb5b3510608e6fe96e0ae4
diff --git a/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py b/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
index 7f5cade..42948c6 100755
--- a/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
+++ b/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
@@ -1706,6 +1706,7 @@
             matched_network = match_networks(
                 {WifiEnums.SSID_KEY: network[WifiEnums.SSID_KEY]},
                 matched_scan_results)
+            ad.log.debug("Network request on match %s", matched_network)
             if matched_network:
                 break