fix(ironic): do not override OpenStack Helm default paths

[cardoe]

These paths are defaulted within /var/lib/openstack-helm and should remain that way to avoid cross filesystem operations.

[skrobul]

Do we want to update this one too:

containers/dnsmasq/dnsmasq/dnsmasq.conf.j2
98:tftp-root={{ env['TFTP_DIR'] | default('/var/lib/understack/master_iso_images') }}

Also bunch of things in deploy repo still refer to those paths

[cardoe]

Do we want to update this one too:

containers/dnsmasq/dnsmasq/dnsmasq.conf.j2
98:tftp-root={{ env['TFTP_DIR'] | default('/var/lib/understack/master_iso_images') }}

Also bunch of things in deploy repo still refer to those paths

Good find. Yes to both.