Fix Spanning Tree Protocol (STP) by changing COPY2CPU which currently
makes switch to ignore Bridge Protocol Data Units (BPDUs).
Tested on Zyxel GS1900-8, 24 and 48.
Signed-off-by: Rudolf Vesely <i@rudolfvesely.com>
[ improve commit description and add new line in different sections ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>