try both 4001 and 2379 etcd ports in SD if not configured #3351
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- if a port is configured, only try this one - else, try on 4001 then 2379 If connection fails, raise a ValueError that is caught in sd_docker_backend
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What does this PR do?
If connection fails, raise a ValueError that is caught in sd_docker_backend
Motivation
This allows a smooth update path to users that upgrade to new versions of etcd and didn't configure their etcd port for SD
Testing Guidelines
Tested manually with: