Add a note about permissions to ceilometer logging directory
Add a note about permissions to ceilometer logging directory

In case of swift monitoring swift needs to init logger for ceilometer.
So it needs to have corresponding permissions on log dir.

Change-Id: I67b4b8e438f7d51dba0575ffaacc0d43ef5040da

openstack/aodh,openstack/aodh,m1093782566/openstack_org_ceilometer,rackerlabs/instrumented-ceilometer,ityaptin/ceilometer,maestro-hybrid-cloud/ceilometer,froyobin/ceilometer,mathslinux/ceilometer,openstack/ceilometer,tanglei528/ceilometer,idegtiarov/ceilometer,cernops/ceilometer,redhat-openstack/ceilometer,NeCTAR-RC/ceilometer,Juniper/ceilometer,Juniper/ceilometer,pczerkas/aodh,sileht/aodh,ityaptin/ceilometer,eayunstack/ceilometer,isyippee/ceilometer,pkilambi/ceilometer,froyobin/ceilometer,NeCTAR-RC/ceilometer,r-mibu/ceilometer,chungg/aodh,chungg/aodh,cernops/ceilometer,isyippee/ceilometer,m1093782566/openstack_org_ceilometer,fabian4/ceilometer,rackerlabs/instrumented-ceilometer,r-mibu/ceilometer,tanglei528/ceilometer,pkilambi/ceilometer,sileht/aodh,mathslinux/ceilometer,tanglei528/ceilometer,luogangyi/Ceilometer-oVirt,MisterPup/Ceilometer-Juno-Extension,rackerlabs/instrumented-ceilometer,openstack/ceilometer,eayunstack/ceilometer,pczerkas/aodh,luogangyi/Ceilometer-oVirt,idegtiarov/ceilometer,fabian4/ceilometer,maestro-hybrid-cloud/ceilometer,NeCTAR-RC/ceilometer,redhat-openstack/ceilometer,MisterPup/Ceilometer-Juno-Extension