fix(linter): remove spurious namespace error

Long ago, Helm did not support cross-namespace installs. There was a
linter rule to catch this. When we changed the way Helm worked, we did
not remove the linter rule. This commit removes that linter rule.

Closes #1489

pkg/lint/rules/template.go

@@ -104,8 +104,6 @@ func Templates(linter *support.Linter) {
 		if !validYaml {
 			continue
 		}
-
-		linter.RunLinterRule(support.ErrorSev, path, validateNoNamespace(yamlStruct))
 	}
 }
 
@@ -196,13 +194,6 @@ func validateYamlContent(err error) error {
 	return nil
 }
 
-func validateNoNamespace(yamlStruct K8sYamlStruct) error {
-	if yamlStruct.Metadata.Namespace != "" {
-		return errors.New("namespace option is currently NOT supported")
-	}
-	return nil
-}
-
 // K8sYamlStruct stubs a Kubernetes YAML file.
 // Need to access for now to Namespace only
 type K8sYamlStruct struct {