Introduce a subscription based lookup model, in order for a client to be
able to listen to a future spawning service. The client can register any
number of queries with the ns and the ns will post lookup-results as
services are registred.
As a special case the list of lookup-results that is sent out as a
result of the registration of a new lookup will be finished by an empty
lookup response, allowing tools like qrtr-lookup to terminate as the
entire list of currently registed services is received.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Add a new set of operations to libqrtr for sending registration events
to the control service, rather than using the nameservice port.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
