Promoter setup: add unlink permission to logrotate policy
Promoter setup: add unlink permission to logrotate policy

One last permission was needed, since the rotation keeps only the last
60 log files, some files now needed to be deleted, and without the
unlink permission, the rotation did not happen

Change-Id: I6e25dc2dcb6fb2c7983c8610a34dc4f63fe36c79

redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config