fix release script (#4762)
fix release script (#4762)

Automatic merge from submit-queue.

fix release script

Fix options processing release script so that it correctly processes destination directory.
frankbu/istio,istio/istio,frankbu/istio,geeknoid/istio,istio/istio,smawson/istio,geeknoid/istio,geeknoid/istio,frankbu/istio,smawson/istio,smawson/istio,geeknoid/istio,smawson/istio,istio/istio,geeknoid/istio,geeknoid/istio,smawson/istio,frankbu/istio,istio/istio,frankbu/istio,frankbu/istio,istio/istio,smawson/istio