Adapt "tools" not to use "linux/net_switch.h"

* the functions in "swctl.c" will not use the data types defined
in this kernel header file;
* also the CDP and RSTP daemons will be compiled only for the LiSA
implementation for now, until the generic sockets are tested and
replaced.

Signed-off-by: Claudiu Ghioc <claudiu.ghioc@gmail.com>