deployUtil: add %s for logging call

In commit d78b36b50 introduces a logging call missing
%s which generates TypeError. With this error ovirt-node
registration is not able to complete.This patch adds the %s.

Change-Id: Id33223b453712f70086f1abec767f3c55f38c37b
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/29819
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>