[iperf_server] Use GCE instances as iperf server instead of MH servers

Enabled ports on GCE instances on each testbed. Config files need to be
updated with the iperf server and port numbers

Bug: 138748245
Test: Verified the changes
Change-Id: Ie98c3e83813d8ce363bbbb7ec97fb4f278c0f801
diff --git a/acts/tests/google/wifi/WifiSoftApAcsTest.py b/acts/tests/google/wifi/WifiSoftApAcsTest.py
index 4637575..fad4a7a 100755
--- a/acts/tests/google/wifi/WifiSoftApAcsTest.py
+++ b/acts/tests/google/wifi/WifiSoftApAcsTest.py
@@ -66,13 +66,10 @@
         asserts.assert_equal(self.dut_client.droid.wifiGetVerboseLoggingLevel(), 1,
             "Failed to enable WiFi verbose logging on the client dut.")
         req_params = []
-        opt_param = ["iperf_server_address", "reference_networks"]
+        opt_param = ["iperf_server_address", "reference_networks",
+                     "iperf_server_port"]
         self.unpack_userparams(
             req_param_names=req_params, opt_param_names=opt_param)
-        if "iperf_server_address" in self.user_params:
-            self.iperf_server = self.iperf_servers[0]
-        if hasattr(self, 'iperf_server'):
-            self.iperf_server.start()
 
     def setup_test(self):
         self.dut.droid.wakeLockAcquireBright()
@@ -92,10 +89,6 @@
             pass
         self.access_points[0].close()
 
-    def teardown_class(self):
-        if hasattr(self, 'iperf_server'):
-            self.iperf_server.stop()
-
     def on_fail(self, test_name, begin_time):
         self.dut.take_bug_report(test_name, begin_time)
         self.dut.cat_adb_log(test_name, begin_time)
@@ -113,7 +106,7 @@
             network, ad = params
             SSID = network[WifiEnums.SSID_KEY]
             self.log.info("Starting iperf traffic through {}".format(SSID))
-            port_arg = "-p {} -t {}".format(self.iperf_server.port, 3)
+            port_arg = "-p {} -t {}".format(self.iperf_server_port, 3)
             success, data = ad.run_iperf_client(self.iperf_server_address,
                                                 port_arg)
             self.log.debug(pprint.pformat(data))