Netdev CI reports occasional failures with this test ("ERROR: ns2-dX6bUE did not pick up tcp connection from peer"). Add explicit busywait call until the initial connection attempt shows up in conntrack rather than a one-shot 'must exist' check. Signed-off-by: Florian Westphal <fw@strlen.de> Link: https://lore.kernel.org/r/20240506114320.12178-1-fw@strlen.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>