[hubble] make get-certs not working

[huntergregory]

make get-certs is creating empty cert files (not retrieving data). It seems like the command to get certs is wrong (empty key '') based on the output. Here is part of the output:

kubectl get secret  -n kube-system -o jsonpath="{.data['']}" | base64 -d > /home/hunter/dev/retina-copy/retina/.certs/tls.crt