port label not found on service check update

[shoenig]

#9707 (comment)

The original problem in this issue was resolved (service registration on job update), but the follow up with port label being lost during service check registration on job update remains. Thought it had been fixed in #9736 but it's still not working.

2021-01-13T13:08:18-06:00  Task hook failed  consul_services: error getting address for check "http port alive": invalid port "http": port label not found
2021-01-13T13:07:57-06:00  Started           Task started by client
2021-01-13T13:07:56-06:00  Driver            Downloading image
2021-01-13T13:07:56-06:00  Task Setup        Building Task Directory
2021-01-13T13:07:56-06:00  Received          Task received by client

[shoenig]

Might be duplicate of #9364, though that one is using a numeric port and this one is using a port label.

[drewbailey]

#9736 fixed the issue for system jobs, but the generic scheduler for service jobs uses a different method to compute in place updates.

[github-actions]

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