BUG 2412 - restconf @POST invokeRpc for notification subscription
* modified notification subscription to work on new api
* added conversion to normalized instance identifier in notification
subscription path
* removed mixin nodes from data change event path
* modified returned paths to skip augmentation identifiers in change
event path
* modified returned location header entry on get stream to use "ws"
protocol
Change-Id: If7f5e92eedbebe0daeb149a38d429a1dcb47c1c9
Signed-off-by: Vaclav Demcak <[email protected]>