Remove rsyslog-config.yml from docs
Remove rsyslog-config.yml from docs

The rsyslog-config.yml playbook no longer exists. This commit updates
the documentation to remove any references to it.

Closes-bug: 1490591
(cherry picked from commit bb475e31915a4afefe75bc2cb35c70845014a6b5)

Conflicts:
	doc/source/install-guide/ops-addcomputehost.rst
Change-Id: Ic3e0e726c170f51d4d272611c7b6c4dec9e2a6fe

yanyao/openstack-deployment,VaneCloud/openstack-ansible,VaneCloud/openstack-ansible,VaneCloud/openstack-ansible,yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment