Description of problem:
Remove collection of data centers statistics
QE sanity. This RFE is for removing only the useless stats on DC, not the entity.
Moving from 4.0 alpha to 4.0 beta since 4.0 alpha has been already released and bug is not ON_QA.
verified in ovirt-engine-dwh-4.0.0-2.el7ev.noarch
oVirt 4.0.0 has been released, closing current release.