When deploying with tls enabled in public
endpoints, ansible modules fails due SSL certificates
are self-signed.

This change adds a new variable to allow customization
on which endpoints ansible should connect.
Defaults to admin because admin auth parameters defaults
to admin endpoint.

Change-Id: Ic3ed58cf9c9579cae08a11bbfe6fce983b5a9cbc
Closes-Bug: #1720995