RFR: 8080272 Refactor I/O stream copying to use java.io.InputStream.transferTo

[Andrey Turbanov]

8080272  Refactor I/O stream copying to use java.io.InputStream.transferTo

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Commit messages:
 - 8080272: Refactor I/O stream copying to use java.io.InputStream.transferTo
 - 8080272: Refactor I/O stream copying to use java.io.InputStream.transferTo

Changes: https://git.openjdk.java.net/jdk/pull/1853/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1853&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8080272
  Stats: 319 lines in 26 files changed: 1 ins; 248 del; 70 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1853.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1853/head:pull/1853

PR: https://git.openjdk.java.net/jdk/pull/1853