### _Why are the changes needed?_
When Kyuubi runs outside of K8s, and w/o enhanced DNS infrastructure, Kyuubi can not access the Pod by using the hostname of Pod, it blocks the user to run Spark on K8s w/ cluster mode out-of-box.
Kyuubi provided a configuration `kyuubi.frontend.connection.url.use.hostname`, turn it off could address this issue, but we can not change the default value globally because of https://github.com/apache/incubator-kyuubi/issues/2266
To improve user experience, we can detect if the Driver is running inside the Pod, and if yes,
change `kyuubi.frontend.connection.url.use.hostname` default value to `false`.
Close#3578
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#3597 from pan3793/k8s.
Closes#3597
8b411781 [Cheng Pan] doc
0df15e79 [Cheng Pan] Engine should prefer to use ip for registing on K8s cluster mode
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
2cb34c4d00