When kernel bonding module is loaded it will create a special
file /sys/class/net/bonding_masters. This is no network device.
Filter it out for getNetworkDevices() call.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
(cherry picked from commit 77d29c9dc0226faa9374ca25fba8dc642c99f303)