DOC - remove reference to Kibana credentials config
DOC - remove reference to Kibana credentials config

Related-Bug: #1535945

Change-Id: Ib346d98428e4c322532bd9d0b10211ce418d30e0

bunchc/openstack-ansible,weezer/openstack-ansible,robb-romans/openstack-ansible,BjoernT/os-ansible-deployment,yanyao/newton,openstack/openstack-ansible,os-cloud/os-ansible-deployment,major/openstack-ansible,Logan2211/openstack-ansible,BjoernT/os-ansible-deployment,stackforge/os-ansible-deployment,openstack/openstack-ansible,BjoernT/openstack-ansible,bunchc/openstack-ansible,mrda/openstack-ansible,BjoernT/os-ansible-deployment,yanyao/newton,os-cloud/os-ansible-deployment,cloudnull/os-ansible-deployment,major/os-ansible-deployment,yanyao/openstack-ansible,BjoernT/openstack-ansible,mrda/openstack-ansible,robb-romans/openstack-ansible,stackforge/os-ansible-deployment,mrda/openstack-ansible,major/openstack-ansible,mancdaz/openstack-ansible,Logan2211/openstack-ansible,cfarquhar/openstack-ansible,major/os-ansible-deployment,yanyao/openstack-ansible,cfarquhar/openstack-ansible,mancdaz/openstack-ansible,weezer/openstack-ansible,cloudnull/os-ansible-deployment