Changelog 1.3 version

This issue was imported from GitHub issue: https://github.com/ktorio/ktor/issues/1482

Ktor Version and Engine Used (client or server and name)

1.3.0-beta-2

Describe the bug In async fail client wraps an exception in CancellationExeption After introducing CompletableJob it'll be right to fail it instead of canceling coroutineContext.

Sample can be found here: https://github.com/ktorio/ktor/blob/3a9bc56d42281bb4433aef500dc4113c2d02a6da/ktor-client/ktor-client-apache/jvm/src/io/ktor/client/engine/apache/ApacheResponseConsumer.kt#L118