Add YangInstanceIdentifierWriter
Add a utility that allows us to emit a number of enter events
into a NormalizedNodeStreamWriter, so we dont have to create
the whole normalized node structure prior to writing into the
stream.
This allows us to ditch InstanceIdTo*Nodes classes, as the creation
of NormalizedNode structure can easily be performed through streaming
events.
JIRA: YANGTOOLS-1392
Change-Id: Iea17a27559573d523cc17683e56b41faafa54f31
Signed-off-by: Tomas Cere <tomas.cere@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>