tools: add "tools/check-tree.sh" script to check consistency of nft dumps

The script performs some checks on the source tree, and fails if
any problems are found.

Currently it only checks for the dumps files, but it shall be extended
to perform various consistency checks of the source tree.

This script was already successful at finding issues with the dumps.
Running it helps to make sure we don't make mistakes.

Later it should also integrate with `make check` and/or be called
from CI.

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

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