Parent schema node input parameter in JsonParserStream

For stable helium

- JsonParserStream - added input parameter to create() factory method which
  specify parent schema node of schema node which is at top level of JSON
  input. Usually it is schema context.

Change-Id: I15ca2bdd0f8ace617d834040cd9a6745b40ee78a
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge "Parent schema node input parameter in JsonParserStream" into stable/helium