spec.ports required value

Maybe I'm missing something, but it looks like `use_tcp: true` is require rather than optional? When left off or set to false, it results in error. Note that `isClusterService: false` is set for what it's worth.

### Reproduce
```yaml
servers:
- zones:
- zone: .
# use_tcp: true
port: 53
```

> Error: UPGRADE FAILED: cannot patch "xyz" with kind Service: Service "xyz" is invalid: spec.ports: Required value

### Workaround
Only way to fix is to require `use_tcp: true`, using `false` results in the same error above.

```yaml
servers:
- zones:
- zone: .
use_tcp: true
port: 53
```