runtime: remove ServiceOffload parameter

Since we no longer use the service_offload configuration,
remove the ServiceOffload field from the image struct.

Signed-off-by: Tobin Feldman-Fitzthum <tobin@ibm.com>

src/runtime/pkg/katautils/config.go

@@ -64,16 +64,10 @@ const (
 type tomlConfig struct {
 	Hypervisor map[string]hypervisor
 	Agent      map[string]agent
-	Image      image
 	Factory    factory
 	Runtime    runtime
 }
 
-type image struct {
-	Provision      string `toml:"provision"`
-	ServiceOffload bool   `toml:"service_offload"`
-}
-
 type factory struct {
 	TemplatePath    string `toml:"template_path"`
 	VMCacheEndpoint string `toml:"vm_cache_endpoint"`