Fix logging in Juju K8s code

This fixes the logging in the juju k8s code base
which wasn't showing up in the LCM logs.
This logging follows the same standard as the rest
of LCM code base.

Change-Id: I569d2bc1e3c50e73ac9af129f1d59775b89cb3ca
Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>
(cherry picked from commit 2f2832cc)