evaluate: misleading error reporting with sets and maps

evaluate: misleading error reporting with sets and maps

When trying to list a map content, if set is used, nft reports:

 # nft list set filter group_7933
 Error: No such file or directory; did you mean set ‘group_7933’ in table ip ‘filter’?
 list set filter group_7933
                 ^^^^^^^^^^

Which is confusing in case user wants to list an existing map:

 # nft list map filter group_7933
 table ip filter {
        map group_7933 {
                type ipv4_addr : classid
                flags interval
                elements = { 10.4.22.0/24 : 1:c7cb }
        }
 }

Instead, give a hint to user that probably wants to list a map, not a set:

 # nft list set filter group_7933
 Error: No such file or directory; did you mean map ‘group_7933’ in table ip ‘filter’?
 list set filter group_7933
                 ^^^^^^^^^^

Fixes: 285bb67a11ad ("src: introduce simple hints on incorrect set")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>