Input/output nodes for an action defined in a grouping have incorrect parents in entry tree

[midakaloom]

Given the following YANG:

module a {
  namespace "urn:a";
  prefix a;

  grouping g {
    action a {
      input {
        leaf in { type string; }
      }
    }
  }

  container c {
    uses g;
  }
}

The following code will cause a panic:

yang.ToEntry(m.Modules["a"]).Find("c/a/input").InstantiatingModule()

This seems to be because the entry tree for the action input (and output, and any of their children) is rooted at the grouping g instead of at the container c.

It works fine if the call to InstantiatingModule() is on the action itself (Find("c/a")), if the action is not defined in a grouping, or if the grouping defines only nodes inside the input or output (e.g. grouping g { leaf in { type string; } }).