Fix errors pointed by shellcheck (#8803)
Fix errors pointed by shellcheck (#8803)

Merging to fix the shellcheck test. This script is not related to any other tests (it does not run in CI yet).
smawson/istio,geeknoid/istio,geeknoid/istio,istio/istio,smawson/istio,istio/istio,geeknoid/istio,istio/istio,smawson/istio,istio/istio,smawson/istio,istio/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,smawson/istio,smawson/istio