hg: jdk/sandbox: license header and newlines

[markus.gronlund at oracle.com]

Changeset: 12b4063e357f
Author:    mgronlun
Date:      2019-10-29 15:16 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/12b4063e357f

license header and newlines

! test/jdk/jdk/jfr/api/consumer/recordingstream/EventProducer.java
! test/jdk/jdk/jfr/api/consumer/recordingstream/TestOnErrorAsync.java
! test/jdk/jdk/jfr/api/consumer/recordingstream/TestOnErrorSync.java