batman-adv: upgrade package to latest release 2016.5

batman-adv: upgrade package to latest release 2016.5

 * support latest kernels (3.2 - 4.10)
 * change installation path back to $INSTALL_MOD_DIR/updates/net/batman-adv
 * add simple (re)broadcast avoidance
 * reduce multicast TT and TVLV update delays under B.A.T.M.A.N. V
 * support B.A.T.M.A.N. V throughput detection when using VLANs on top of WiFi
 * improve documentation of sysfs and debugfs files
 * coding style cleanups and refactoring
 * bugs squashed:
   - detect missing primaryif during tp_send as error
   - fix re-adding of previously removed interfaces via rtnetlink
   - fix rare race conditions on interface removal
   - handle allocation error when generating TT responses

Signed-off-by: Sven Eckelmann <sven@narfation.org>