Some parameters like vlan_limit or hw-offload expect integer values
and boolean values. However current vs_config accepts only strings
and we need to convert integer or boolena to string in manifests
explicitly.
This change makes vs_config accept integers and booleans so that
we can use more "native" types to define values.
Change-Id: I6f1dfd33cc85d84a53e346f45359ce382e5fda26
becab37c5e