core: Replace oVirt logger with slf4j in utils

Replaces oVirt logger with slf4j in utils module.

Change-Id: I0b99ca3947a3ad778601da27decdbad751cfa19c
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>
core: Replace oVirt logger with slf4j in dal

Replaces oVirt logger with slf4j in dal module.

Change-Id: I93097f15d26bb1c5498505a31dc927e32c94b554
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>