tools: Replace oVirt logger with slf4j as frontend in engine-manage-domains

Replaces oVirt logger with slf4j as logging frontend in classes which are
used in engine-manage-domains tool.

Change-Id: I82996f8f6ad3b7111b5bb36d46a395d94dd70e80
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>