std.native('manifestYamlFromJson') may no longer be required

[jacobstr]

Consider this diff:

diff --git a/ksonnet-util/util.libsonnet b/ksonnet-util/util.libsonnet
index a151e8a..683eafc 100644
--- a/ksonnet-util/util.libsonnet
+++ b/ksonnet-util/util.libsonnet
@@ -225,8 +225,7 @@ local util(k) = {
     ]),

   manifestYaml(value):: (
-    local f = std.native('manifestYamlFromJson');
-    f(std.toString(value))
+    std.manifestYamlDoc(value)
   ),

   resourcesRequests(cpu, memory)::

I'm trying to avoid using tanka just for this function. Note that there are some formatting differences - the generated yaml using the built-in likes to quote all key names:

google/jsonnet#821

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.