add create and delete namespace to runtime (#1965)

* add create and delete namespace to runtime

* dial down aggressive expiry

* add logging

* fix deletenamespace

* add start of k8s unit tests

* fix workflow

* turn on k8s tests

* ease tight tests

* mkdir in workflow

* dammit -p

* setup folder

runtime/runtime.go

@@ -30,6 +30,10 @@ type Runtime interface {
 	Stop() error
 	// String describes runtime
 	String() string
+	// CreateNamespace creates a new namespace in the runtime
+	CreateNamespace(string) error
+	// DeleteNamespace deletes a namespace in the runtime
+	DeleteNamespace(string) error
 }
 
 // Logs returns a log stream