test: fixing cif getinstance issue

During running jsonrpc test cif.getInstance fails due to missing logger.
We mock getInstance method to return fake cif.

Change-Id: I7a4248519c01d21dee2f55f7e150c931b75e30e2
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/29188
Reviewed-by: Dan Kenigsberg <danken@redhat.com>