Add JNI methods to support multiple nodes with same name

In I93417795b4b3d8b97e61385e4a24e45e562d3382 we added new node
fields. Now we add methods to retrieve the values for these fields
from Java.

These methods return default values and this change is a no-op

Subsequent cls will fill in the Java logic for the methods

Test: Manual && fsstress for ~24hrs
Bug: 158466177
Change-Id: I39cf223d5bb5f7b959dbb59ec3035083f6b3b384
3 files changed