Override compute_instant_snapshots_v1::InstantSnapshotsClient Endpoint Configuration

  // This configuration is common with Private Google Access:
 
//     https://cloud.google.com/vpc/docs/private-google-access
 
auto options = google::cloud::Options{}.set<google::cloud::EndpointOption>(
     
"private.googleapis.com");
 
auto client =
      google
::cloud::compute_instant_snapshots_v1::InstantSnapshotsClient(
          google
::cloud::compute_instant_snapshots_v1::
             
MakeInstantSnapshotsConnectionRest(options));