hg: jdk/sandbox: 8202290: AtomicAppend tests fail on macOS 10.13 ("High Sierra")

[chris.hegarty at oracle.com]

Changeset: d8327f838b88
Author:    bpb
Date:      2018-05-25 07:22 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/d8327f838b88

8202290: AtomicAppend tests fail on macOS 10.13 ("High Sierra")
Summary: Reinstate actual running of tests for macOS version >= 10.13.
Reviewed-by: alanb

! test/jdk/java/io/FileOutputStream/AtomicAppend.java
! test/jdk/java/nio/channels/FileChannel/AtomicAppend.java