adds nameOverride/fullnameOverride to values.yaml

Prior to Helm v2.8, `helm lint --strict' did not fail when trying to use
values that did not exist in the values.yaml file. Now that this
behavior has changed, we need to add those variables to our file to pass
a strict linting test.

pkg/chartutil/create.go

@@ -93,6 +93,10 @@ nodeSelector: {}
 tolerations: []
 
 affinity: {}
+
+# Override chart app names with caution, here be dragons!
+nameOverride: ""
+fullnameOverride: ""
 `
 
 const defaultIgnore = `# Patterns to ignore when building packages.