Cherry-pick #11118 to 7.x: [Heartbeat] Fix status for TCP checks (Master) #11138
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Cherry-pick of PR #11118 to 7.x branch. Original message:
This is a cherry-pick of #10777 to the master branch (which can then be backported to 7.x and 7.0). I opened this concurrently to get it in sooner.
The heartbeat checks for TCP send/receive have been broken for a long time, since at least 6.3 from my testing. An error was returned, but the status was still set to 'up'.