tools: Replace log4j with slf4j as frontend in engine-manage-domains

Replaces log4j with slf4j as logging frontend in classes which are used
in engine-manage-domains tool.

Change-Id: Ic271b2d29e31abcf7bc1ca7e8f5a7c7e95fdfcf8
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>