Do not use sh in istioctl. (#13395)
Do not use sh in istioctl. (#13395)

* Do not use sh in istioctl.

Co-authored-by: Jakob Schmid <258446683e3b3d1ae431f15725c4c7f7152b2671@sap.com>

* Fix lint errors.

Co-authored-by: Jakob Schmid <258446683e3b3d1ae431f15725c4c7f7152b2671@sap.com>

geeknoid/istio,smawson/istio,smawson/istio,geeknoid/istio,istio/istio,geeknoid/istio,geeknoid/istio,istio/istio,smawson/istio,istio/istio,istio/istio,smawson/istio,geeknoid/istio,smawson/istio,smawson/istio,geeknoid/istio,istio/istio