testing: selftests: nft_flowtable.sh: use random netns names
[ Upstream commit b71b7bfe ] "ns1" is a too generic name, use a random suffix to avoid errors when such a netns exists. Also allows to run multiple instances of the script in parallel. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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