In change I1f25300d44b04ca5bcdd9b505319f0d089a9c964, log-config has been
removed and replaced with log_config_append
Change-Id: I7533f6eebfdb5ad5f2594a5436814fcecfc4c583
Import all docs from openstack-manuals.
Part of bp: doc-migration
Change-Id: I28bb8ce1f4a8653f176a554d2e95b4423c437972
Co-Authored-By: Stephen Finucane <sfinucan@redhat.com>