ip link gre: print only relevant info in external mode

Display only attributes that are relevant when a GRE interface is in
'external' mode instead of the default values (which are ignored by the
kernel even if passed back).

Fixes: 926b39e1feffd ("gre: add support for collect metadata flag")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
1 file changed