Lower backup poll interval in async_end2end_test

test/cpp/end2end/async_end2end_test.cc

@@ -458,6 +458,7 @@ TEST_P(AsyncEnd2endTest, SequentialRpcs) {
 }
 
 TEST_P(AsyncEnd2endTest, ReconnectChannel) {
+  // GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS is set to 100ms in main()
   if (GetParam().inproc) {
     return;
   }
@@ -2012,9 +2013,9 @@ INSTANTIATE_TEST_CASE_P(AsyncEnd2endServerTryCancel,
 }  // namespace grpc
 
 int main(int argc, char** argv) {
-  // Change the backup poll interval from 5s to 200ms to speed up the
+  // Change the backup poll interval from 5s to 100ms to speed up the
   // ReconnectChannel test
-  gpr_setenv("GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS", "200");
+  gpr_setenv("GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS", "100");
   grpc_test_init(argc, argv);
   gpr_tls_init(&g_is_async_end2end_test);
   ::testing::InitGoogleTest(&argc, argv);