Staging: batman-adv: Add last-seen in originator table

Right now, there is no easy/intuitive way to find out whether a node
might have vanished. This commit adds the time when a node was last seen
to the originator table output, so that a common user is able to tell
whether a node might have gone without having to wait PURGE_TIMEOUT
seconds until that node gets "garbe-collected".
It also puts the the versioning information in an extra line, as
the first one of this debug output would otherwise get too long.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>