fix new cluster tests issues (#9657)
Following #9483 the daily CI exposed a few problems. * The cluster creation code (uses redis-cli) is complicated to test with TLS enabled. for now i'm just skipping them since the tests we run there don't really need that kind of coverage * cluster port binding failures note that `find_available_port` already looks for a free cluster port but the code in `wait_server_started` couldn't detect the failure of binding (the text it greps for wasn't found in the log) (cherry picked from commit 7d6744c7)
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