RFR: JDK-8299994: java/security/Policy/Root/Root.java fails when home directory is read-only

[Bill Huang]

Root.java is changed to a manual test because it requires test to be run with the root user privilege, and it requires to modify the user policy file in the home director.

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Commit messages:
 - JDK-8299994 java/security/Policy/Root/Root.java fails when home directory is read-only

Changes: https://git.openjdk.org/jdk/pull/12354/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12354&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299994
  Stats: 18 lines in 3 files changed: 15 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12354.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12354/head:pull/12354

PR: https://git.openjdk.org/jdk/pull/12354