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Fix external test hang in redis-cli test when run in a certain order (#13423)
When the tests are run against an external server in this order: `--single unit/introspection --single unit/moduleapi/blockonbackground --single integration/redis-cli` the test would hang when the "ASK redirect test" test attempts to create a listening socket (it fails, and then redis-cli itself hangs waiting for a non-responsive socket created by the introspection test). the reasons are: 1. the blockedbackground test includes util.tcl and resets the `::last_port_attempted` variable 2. the test in introspection didn't close the listening server, so it's still alive. 3. find_available_port doesn't properly detect the busy port, and it thinks that the port is free even though it's busy. fixing all 3 of these problems, even though fixing just one would be enough to let the test pass.
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