Use the server IP for the AWX database host when the rails config is no good #16621
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Previously we would check the database configuration (database.yml)
then if that host wasn't set or was localhost we would try to use the
docker host gateway.
But we have a better option. We can use the server's ip instead.
This leaves the docker gateway as the last option as that will probably
still be needed for development environments.
Before this change AWX was failing on appliances if the appliance was running the database locally.