Add --own-project option
Add --own-project option

--own-project allows a non-admin user to delete all resources in its
own project.

Change-Id: I66fa1cfb094682891bc04f1d906b310c98dbd147

JonasPf/ospurge,openstack/ospurge,tnahak/ospurge,remoteur/ospurge,DigitalPacific/ospurge,openstack/ospurge,FlorentFlament/ospurge-packaging,stackforge/ospurge