Added a possibility fora consumer to choose how many concurrent REST sessions it can handle.
If correct message sequence it to be maintained, this must be set to 1.
Taking a rest if the consumer is unavialable.
Trying to restart strems at overflow, which does not work.
Signed-off-by: PatrikBuhr <patrik.buhr@est.tech>
Issue-ID: NONRTRIC-597
Change-Id: I05ffe17dd39fb7a20aeb394b258c2b0cb0f4c638