[jdk13u-dev] RFR: 8249867: XML declaration is not followed by a newline

[Yuri Nesterenko]

Backport of this change differs from the original in copyright dates/lastchanged comments and a list of bugs in the test. We need this fix to be on par with LTS releases. Required CSR is approved.

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Commit messages:
 - Backport 69ee314b63a9f260e3dcbe9ccd67ddc4faec3ba0

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/328/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=328&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249867
  Stats: 476 lines in 5 files changed: 428 ins; 2 del; 46 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/328.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/328/head:pull/328

PR: https://git.openjdk.java.net/jdk13u-dev/pull/328