Ironic containers: chown /var/lib/ironic correctly

Ironic containers: chown /var/lib/ironic correctly

This updates the docker version of ironic-conductor.yaml so
that it sets permissions on the entire /var/lib/ironic
tree correctly. Since 1a4ece16cea40075fe7332ed048b9c289b3ff424
we bind mount in /var/lib/ironic from the host (created via
Ansible if it didn't already exist). This caused a subtle
permissions issue in that the Ironic conductor service
can no longer create sub-directories it needs to operate.

Change-Id: I1eb6b5ddad7cd89ee887e2e429ebe245aa7b80dc
Closes-bug: 1677086