Add a TODO to remove python3 -u

when https://github.com/iovisor/bcc/pull/5142 is deployed

Bug: n/a
Test: n/a

Change-Id: I726fa02cee7d622e74403747f2c489eebfe022c7
diff --git a/guest/forwarder_guest_launcher/src/main.rs b/guest/forwarder_guest_launcher/src/main.rs
index 16b05b4..0bb3b4d 100644
--- a/guest/forwarder_guest_launcher/src/main.rs
+++ b/guest/forwarder_guest_launcher/src/main.rs
@@ -110,6 +110,7 @@
 async fn report_active_ports(
     mut client: DebianServiceClient<Channel>,
 ) -> Result<(), Box<dyn std::error::Error>> {
+    // TODO: we can remove python3 -u when https://github.com/iovisor/bcc/pull/5142 is deployed
     let mut cmd = Command::new("python3")
         .arg("-u")
         .arg("/usr/sbin/tcpstates-bpfcc")