feat(helm): use openssl sha1 command
feat(helm): use openssl sha1 command

Currently the bash script that installs Helm is hard-coded to use
openssl sha command but some distros like Debian 9 only have sha1.
Since the popular current distros have sha1 we can switch to that.

Closes(#2859)

fibonacci1729/helm,helm/helm,bacongobbler/helm,fibonacci1729/helm,appscode/helm,helm/helm,eicnix/helm,jascott1/helm,technosophos/deployment-manager,jascott1/helm,michelleN/deployment-manager,SlickNik/helm,technosophos/k8s-helm,adamreese/deployment-manager,michelleN/deployment-manager,technosophos/k8s-helm,adamreese/helm,eicnix/helm,technosophos/deployment-manager,michelleN/deployment-manager,michelleN/deployment-manager,bacongobbler/helm,technosophos/deployment-manager,technosophos/deployment-manager,appscode/helm,adamreese/helm,technosophos/deployment-manager,adamreese/deployment-manager,adamreese/deployment-manager,SlickNik/helm,adamreese/deployment-manager,adamreese/deployment-manager