[jdk8u] RFR: 8290832: It is no longer possible to change "user.dir" in the JDK8

[Paul Hohensee]

On Fri, 29 Jul 2022 03:46:56 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> This is the request to revert the fix for [JDK-8194154](https://bugs.openjdk.org/browse/JDK-8194154) integrated to the [openjdk8u342](https://github.com/openjdk/jdk8u/commit/5fcfb7acbe340c8347bd47413a36dd0b1e267dc1)
> 
> The fix for [JDK-8194154](https://bugs.openjdk.org/browse/JDK-8194154) disabled the possibility to change the "user.dir" property.
> Changing the "user.dir" was not recommended from the beginning but it was not forbidden, so there are some old applications that rely on the old behavior. 
> 
> For compatibility reasons, it would be good to restore the old behavior.
> 
> This PR reverts this commit: https://github.com/openjdk/jdk8u/commit/5fcfb7acbe340c8347bd47413a36dd0b1e267dc1

Copyright dates need to be reverted in UnixFileSystem.java and WinNTFileSystem.java. Other than that, lgtm.

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Changes requested by phh (Reviewer).

PR: https://git.openjdk.org/jdk8u/pull/14