Better error reporting for BPF dataplane

[astoycos]

Today for all our TC BPF programs we execute our programs but ALWAYS return TC_ACT_OK regardless of the success or failure within our BPF program.
for example

#[classifier(name = "tc_ingress")]
pub fn tc_ingress(ctx: TcContext) -> i32 {
    match try_tc_ingress(ctx) {
        Ok(ret) => ret,
        Err(_) => TC_ACT_SHOT,
    };

    // TODO(astoycos) better Error reporting framework
    return TC_ACT_OK;
}

We should rethink this and at the very least let the user know that our programs failed in the event of a problem. I think a log would be fine for now.

[shaneutt]

Not stale, just not ready for work yet as its intended for a later milestone (https://github.com/kubernetes-sigs/blixt/milestone/5).

/remove-lifecycle stale