Improve 'ambiguous' notification in macmap.
Improve 'ambiguous' notification in macmap.

When two nodes are ambiguous, provide more
info (mac) and also a suggestion of
which of the two appears most
trunk-like if one of them looks
suspiciously like a trunk.

xcat2/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent