Drop deprecated namespace for oslo.rootwrap
Drop deprecated namespace for oslo.rootwrap

The oslo team is recommending everyone to switch to the
non-namespaced versions of libraries.[1]
oslo.rootwrap suggests to use oslo_rootwrap.cmd:main.[2]

[1]https://blueprints.launchpad.net/oslo-incubator/+spec/drop-namespace-packages
[2]https://github.com/openstack/oslo.rootwrap#using

Change-Id: I94a58f45863141d5797b7f950ae5efa14fd88e85

eayunstack/ceilometer,pkilambi/ceilometer,openstack/ceilometer,pkilambi/ceilometer,isyippee/ceilometer,cernops/ceilometer,pczerkas/aodh,eayunstack/ceilometer,redhat-openstack/ceilometer,openstack/aodh,fabian4/ceilometer,isyippee/ceilometer,ityaptin/ceilometer,chungg/aodh,openstack/ceilometer,Juniper/ceilometer,r-mibu/ceilometer,mathslinux/ceilometer,r-mibu/ceilometer,openstack/aodh,pczerkas/aodh,cernops/ceilometer,idegtiarov/ceilometer,sileht/aodh,idegtiarov/ceilometer,maestro-hybrid-cloud/ceilometer,redhat-openstack/ceilometer,Juniper/ceilometer,sileht/aodh,maestro-hybrid-cloud/ceilometer,mathslinux/ceilometer,ityaptin/ceilometer,chungg/aodh,fabian4/ceilometer