Use a python shim for running for auth_ed25519 helper
Use a python shim for running for auth_ed25519 helper

When mysql ed25519 authentication is enabled, puppet-tripleo
uses a python helper to generate password hashes. Python
helpers have their +x permission stripped on install time,
so run the helper via the right python interpreter instead.

Change-Id: I13b02af166d7767799be99a0fb52066b00637a01
Related-Bug: #1866093

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo