fix psp role

[bwagner5]

Issue #, if available:
#417

Description of changes:

• Change the ClusterRole to a namespace scoped role and move RoleBinding to proper namespace reference.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[haugenj]

LGTM 👍

[gabegorelick]

I'm trying to test that this fixes #417, but it looks like the roleRef in the RoleBinding is wrong. The kind for the resource was changed from ClusterRole to Role, but the RoleBinding wasn't updated:

roleRef: 
  apiGroup: rbac.authorization.k8s.io 
  kind: ClusterRole # should be Role?
  name: {{ template "aws-node-termination-handler.fullname" . }}-psp

EDIT: filed #441 for that.