Add scripts for testing and development

[erthalion]

Using network workload requires some infrastructure in place. Add few scripts to make it easier, plus one "proto" integration test to verify the dynamic configuration is generating some connections.

[JoukoVirtanen]

The script for the smoke test is a good idea, but I am having difficulty getting it to run and pass. A docker image that could run it would be nice. Here is what I have tried so far. I modified Dockerfile so that it has the following contents

FROM builder:latest as builder

FROM registry.fedoraproject.org/fedora:38

RUN mkdir /etc/berserker

RUN dnf install bpftrace bpftool which -y

COPY --from=builder /berserker/target/release/berserker /usr/local/bin/berserker
COPY --from=builder /berserker/workload.toml /etc/berserker/workload.toml
COPY --from=builder /berserker/stub /usr/local/bin/stub
COPY --from=builder /berserker /berserker

ENV PATH="${PATH}:/usr/local/bin"

ENTRYPOINT berserker

Ran the following commands.

make

docker image ls | grep berserker
berserker                                              latest                                         e214c88f10e2   2 days ago      1.33GB
quay.io/rhacs-eng/collector-performance                berserker-1.1.3                                3a3b278be61a   9 days ago      185MB


docker run -it --privileged --cap-add=SYS_ADMIN --cap-add=SYS_PTRACE --cap-add=NET_ADMIN --entrypoint /bin/bash e214c88f10e2

Within the docker container

cd berserker

mount -t debugfs none /sys/kernel/debug
mount -t tracefs none /sys/kernel/debug/tracing

sudo dnf install iproute
sudo dnf install iptables
sudo dnf install procps-ng

./scripts/network/prepare-tap.sh

tests/workers/network/smoke.sh 
Cleanup...
Starting bpftrace...
Starting the server...
Starting the client...
Stopping...
Verifying the results...
FAIL
Attaching 2 probes...

[JoukoVirtanen]

I got this to pass. I changed tests/workers/network/sys_accept.bt to

k:__sys_accept* /comm == "berserker"/
{
   printf("accept berserker\n");
}

It also seems flaky, since it did not pass on the first try.

[JoukoVirtanen]

I have tested this after the latest changes and it is working.