Remove noisy log message from CPU metadata collector

Change-Id: Ic186c68bf378e9e6016a568fc2a5e59b009bac8d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1119336
Signed-off-by: Martin Sivak <msivak@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30038
Reviewed-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>