zebra: make current show nexthop-group cli zebra-specific

There's confusion between the nexthop-group configuration and a
zebra-specific show command. For now, make the zebra show
command string RIB-specific until we're able to unify these
paths.

Signed-off-by: Mark Stapp <mjs@voltanet.io>

zebra/zebra_vty.c

@@ -1351,9 +1351,10 @@ DEFPY (show_interface_nexthop_group,
 
 DEFPY (show_nexthop_group,
        show_nexthop_group_cmd,
-       "show nexthop-group <(0-4294967295)$id|[<ip$v4|ipv6$v6>] [vrf <NAME$vrf_name|all$vrf_all>]>",
+       "show nexthop-group rib <(0-4294967295)$id|[<ip$v4|ipv6$v6>] [vrf <NAME$vrf_name|all$vrf_all>]>",
        SHOW_STR
        "Show Nexthop Groups\n"
+       "RIB information\n"
        "Nexthop Group ID\n"
        IP_STR
        IP6_STR