Wrap Nuage API calls into utility function
Wrap Nuage API calls into utility function

With this commit we wrap Nuage API calls with utility function
that ensures that appropriate type of default value is returned
in case when Nuage returns invalid (empty) response.

Signed-off-by: Miha Pleško <e42a14dbca5c0965023849a10306da025a317640@xlab.si>

RedHatQE/mgmtsystem