[FIX] Increase default value for request queues

On a network with more than 10 nodes the queue for status requests
was too small and buffer overflows occured. Therefore the size of
the request queues for IdentReq and StatusReq is increased to be
large enough for networks up to 40 nodes.

For small MN systems, the values can be scaled down by redefining
them in oplkcfg.h.

Change-Id: I2252db5175bec38274c095243beb557ac06267d7
Reviewed-on: http://brateggevoat1/gerrit/2384
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Wolfgang Seiss <wolfgang.seiss@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[TASK] Add debug code to retrieve maximum used circbuffer size

Change-Id: Ia95857359307f99f267802f8548d853095a90bb1
Reviewed-on: http://brateggevoat1/gerrit/2385
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Wolfgang Seiss <wolfgang.seiss@br-automation.com>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>