* Top-level default leafs assigned.

* Enforcing RFC 7950 Sec 7.6.1 means unassigned top-level leafs (or leafs under non-presence containers) are assigned default values.
* NACM default behaviour is read-only (empty configs are dead-lockedd)
  * This applies if NACM is loaded and `CLICON_NACM_MODE` is `internal`
* Fixed: [default values don't show up in datastores #111](https://github.com/clicon/clixon/issues/111)

test/test_perf_mem.sh

@@ -27,9 +27,6 @@ module scaling{
    yang-version 1.1;
    namespace "urn:example:clixon";
    prefix ex;
-   import "clixon-config" {
-     prefix cc;
-   }
    container x {
     list y {
       key "a";