tests: shell: resolve check-tree.sh errors

tests: shell: resolve check-tree.sh errors

It prints a few errors like this:

ERR:  "tests/shell/testcases/chains/jump_to_base_chain" has no "tests/shell/testcases/chains/dumps/jump_to_base_chain.{nft,nodump}" file

For all of those, add the relevant .nft dump file.

Add a 'nodump' file in case the test doesn't print anything (e.g.
because the test checks that invalid ruleset fails validation).

Some tests have a .nft but not .json-nft, this is because json lacks
some features, in particular "typeof" and anonymous/implicit chains.

ERR:  "tests/shell/testcases/maps/delete_element_catchall" has no "tests/shell/testcases/maps/dumps/delete_element_catchall.{nft,nodump}" file
ERR:  "tests/shell/testcases/maps/dumps/delete_elem_catchall.nft" has no test "tests/shell/testcases/maps/delete_elem_catchall"

these two are related, rename the dump file to match the script name.

Signed-off-by: Florian Westphal <fw@strlen.de>