selftests: netfilter: use randomized netns names
Using ns0, ns1, etc. isn't a good idea, they might exist already. Use a random suffix. Also, older nft versions don't support "-" as alias for stdin, so use /dev/stdin instead. Signed-off-by: NFlorian Westphal <fw@strlen.de> Acked-by: NPhil Sutter <phil@nwl.cc> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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