Composite node <-> normalized node serializer and deserializer

- add AnyXmlNodeBase parser and serializer
- in ContainerNodeCnSnSerializer and MapEntryNodeCnSnSerializer was used
MutableCompositeNodeTOImpl which uses init() method which is deprecated
therefore it was rewritten and also whole package was renamed.
- support for AnyXml yang type to yang-data-composite-node

Change-Id: Icef3549e402eee0da074900a3db6e2959a5a67a5
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge "Composite node <-> normalized node serializer and deserializer"