Fixes: #8852
The `while (true) {` causes the thread to be blocked forever.
The `stop()` waits on the `if (!executorService.awaitTermination(10, TimeUnit.SECONDS)) {` the whole time
* Fix with the `while (isActive()) {`
* Remove the `ConnectionFactoryTests.testEarlyCloseNet()` since we cannot reach expectations because of
race condition between `start()` and `stop()`
**Cherry-pick to `6.2.x` & `6.1.x`**
(cherry picked from commit 0b60dfc9d1)
ab3516cb86