RFR: 8287097: (fs) Files::copy requires an undocumented permission when copying from the default file system to a non-default file system

[Brian Burkhalter]

Ignore the `SecurityException` thrown while trying to retrieve the POSIX attributes when a `SecurityManager` is set.

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Commit messages:
 - 8287097: (fs) Files::copy requires an undocumented permission when copying from the default file system to a non-default file system

Changes: https://git.openjdk.java.net/jdk/pull/8963/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8963&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287097
  Stats: 76 lines in 3 files changed: 69 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8963.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8963/head:pull/8963

PR: https://git.openjdk.java.net/jdk/pull/8963