Add DOMInstanceNotificationService
DOMNotificationService provides a means to subscribe to top-level
notifications, as defined by YANG 1.0. RFC7950 (YANG 1.1) extended
this construct with the notion that notifications can be bound to
a datastore instance.
Define a set of DOMInstanceNotification* interfaces which cover provide
a conterpart to DOMNotification* interfaces and cover the extensions
introduced in YANG 1.1.
JIRA: MDSAL-494
Change-Id: I610f761bfcb9fb292709dd12618ec5bcb9b843c2
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>