Cleanup usages of resolver.Target.Scheme

[easwars]

resolver.Target.Scheme is marked as deprecated, and we added resolver.Target.URL which is the more preferred way of getting to the details of the parsed target.

#5750 is replacing usages of resolver.Target.Scheme in clientconn.go. But we have other usages spread across the codebase, and it would be a nice thing to clean those up as well.

[kylejb]

Does #5761 close this issue and cleanup usages of resolver.Target.Authority?

The only bits where we seem to use resolver.Target.Scheme that I found is here and here. Do we want to remove those lines or continue to set usable values to the deprecated resolver.Target.Scheme?

[easwars]

Yes, it does close this issue. And the two bits you pointed to, we can continue to have them. Thank you @kylejb .