RFR: 8280494: (D)TLS signature schemes [v5]

[Xue-Lei Andrew Fan]

> This update is to support signature schemes customization for individual (D)TLS connection.  Please review the CSR as well:
> CSR: https://bugs.openjdk.java.net/browse/JDK-8280495
> RFE: https://bugs.openjdk.java.net/browse/JDK-8280494

Xue-Lei Andrew Fan has updated the pull request incrementally with one additional commit since the last revision:

  Less objects construction

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7252/files
  - new: https://git.openjdk.java.net/jdk/pull/7252/files/0000922f..b8ed2506

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7252&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7252&range=03-04

  Stats: 13 lines in 2 files changed: 10 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7252.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7252/head:pull/7252

PR: https://git.openjdk.java.net/jdk/pull/7252