Merge branch 'tipc-obsolete-zone-concept'

Jon Maloy says:

====================
tipc: obsolete zone concept

Functionality related to the 'zone' concept was never implemented in
TIPC. In this series we eliminate the remaining traces of it in the
code, and can hence take a first step in reducing the footprint and
complexity of the binding table.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>