Refactor:

- Support for module features
- Remove kubenix.module and rather use explicit modules
- Make tests framework independent of k8s module
- Remove metacontroller submodule, which will go to kubenix-modules
- Improved submodule propagation and passthru
- Added additional test for k8s-submodule

tests/k8s/1.13/crd.nix

@@ -1,4 +1,4 @@
-{ config, lib, kubenix, ... }:
+{ config, lib, kubenix, k8sVersion, ... }:
 
 with lib;
 
@@ -17,6 +17,8 @@ in {
     }];
   };
 
+  kubernetes.version = k8sVersion;
+
   kubernetes.api.customresourcedefinitions.crontabs = {
     metadata.name = "crontabs.stable.example.com";
     spec = {