tipc: update link and node list output format

To more closely resemble that of "tipc-config", we don't want to break
user scripts if we don't have a good reason for it.

Change-Id: I35e819dacf8e9a0ebdd1a2a9a90792f2218bc904
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>