package installation required for netma tests

Hi Alejandros @tjaarda @alejandroi2cat,

regarding the tests we talked about here, I have to install the ping and tcpdump dependencies manually in every test:

kubectl exec -n $NAMESPACE $LPM_C1_POD -- bash -c "apt update && apt install -y iputils-ping iproute2 tcpdump" > /dev/null 2>&1
kubectl exec -n $NAMESPACE $LPM_C2_POD -- bash -c "apt update && apt install -y iputils-ping iproute2 tcpdump" > /dev/null 2>&1

It is not a huge deal, and the tests work fine, but I think having these preinstalled would be a more correct approach. Is this even possible?