Put `memory` before `mem` when parsing `show ip fib` CLI command to
avoid the following annoying output error.
vpp# show ip fib memory
ipv4-VRF:0 mtrie:343808 hash:4687
totals: mtrie:343808 hash:4687 all:348495
unknown input `ory'
Type: fix
Signed-off-by: Jay Wang <jay.wang2@arm.com>
Change-Id: I5f990243309d6e6ea339e8442f5e68ae90a98814