qosmngr: updated broadcom.sh to get the ports from the runner.

When using the runner accelerator we need to check how to map between ethernet interfaces (i.e eth0) and the internal names used by the runner (i.e. port/index=lan2). Depending on the hardware the mapping is not always 1:1 as assumed earlier.

This commit also fixes a minor bug with resetting traffic shaping for the archer accelerator.