Inject RPC input QName into LazySerializedContainerNode

Inject RPC input QName into LazySerializedContainerNode

When ExecuteRpc message is sent with LazySerializedContainerNode
as 'input' parameter, during serialization is invoked its
getIdentifier() method that returns NodeIdentfier of rpc,
not input. So OpsInvoker receives the message with incorrect 'input'
parameter and  we get error downstream because of it.

We need to inject rpc input Qname into LazySerializedContainerNode
to get NodeIdentifier of rpc input from getIdentifier() method. While we
are at it, let's pass a NodeIdentifier, which saves us the cost of
NodeIdentifier.create() in the fast path.

JIRA: MDSAL-739
Change-Id: I77c870fe91a758037bd27e54607e778255d611fc
Signed-off-by: Dominik Vrbovsky <dominik.vrbovsky@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>