Support TCP_USER_TIMEOUT option

[yangbodong22011]

Solve #2082

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[yangbodong22011]

@mp911de Can you provide me with a snapshot version to run the tests mentioned in #2082.
p.s. I tried locally using mvn clean package; mvn clean install to install the SNAPSHOT version, but for some reason it didn't work.

[mp911de]

I use make test to spin up Redis instances and run the tests.

Thank you for your contribution. That's merged, polished, and backported now.