Add services to ServiceNetMap to select hostnames resolution network

The *HostnameResolveNetwork services define the network against
which the hostnames in /etc/hosts should be resolved, defaults
to 'internal_api' for all except CephStorage for which it uses
'storage' as they do not have connectivity to 'internal_api'.

Closes-Bug: 1471179
Change-Id: Ia8971f8a63016966236e7975ac2d97921a314255