[jdk8u-dev] RFR: Merge jdk8u:master

[Andrew John Hughes]

Merge 8u345 interim release back into 8u-dev

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Commit messages:
 - Merge
 - 8290832: It is no longer possible to change "user.dir" in the JDK8
 - 8291568: Bump update version of OpenJDK: 8u345

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/jdk8u-dev/pull/95/files
  Stats: 67 lines in 3 files changed: 0 ins; 65 del; 2 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/95.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/95/head:pull/95

PR: https://git.openjdk.org/jdk8u-dev/pull/95