RFR: 8080272 Refactor I/O stream copying to use java.io.InputStream.transferTo [v6]

[Andrey Turbanov]

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

Andrey Turbanov has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

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

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1853/files
  - new: https://git.openjdk.java.net/jdk/pull/1853/files/ec602c1a..6f8ec711

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1853&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1853&range=04-05

  Stats: 135 lines in 13 files changed: 102 ins; 2 del; 31 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