VPP-1549 Add missing counter name.
show interface
Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count
local0 0 down 0/0/0/0
pg0 1 down 9000/0/0/0 rx packets 582
rx bytes 34051
tx packets 4
tx bytes 364
drops 323
ip6 1
(nil) 580
----
show interface
Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count
local0 0 down 0/0/0/0
pg0 1 down 9000/0/0/0 rx packets 582
rx bytes 34051
tx packets 4
tx bytes 364
drops 323
ip6 1
mpls 580
Change-Id: I3dcde4799764277535baf42f855e4e8bb48c0d02
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>