Add deploy: mode: global support

Adds support for deploy: mode.

For example:

```yaml
version: "3"

services:
  foo:
    deploy:
      resources:
        mode: global
        replicas: 6
    image: redis
```

Will only generate replicas: 1 in Kubernetes pods as "global" limits
replicas to only one.

pkg/loader/compose/v3.go

@@ -198,6 +198,8 @@ func dockerComposeToKomposeMapping(composeObject *types.Config) (kobject.Kompose
 		// Deploy keys
 		//
 
+		serviceConfig.DeployMode = composeServiceConfig.Deploy.Mode
+
 		if (composeServiceConfig.Deploy.Resources != types.Resources{}) {
 
 			// memory: