RFR: 8262186: Callback semantics of the method X509KeyManager.chooseClientAlias(...) [v2]

[Weijun Wang]

> This code change collects all key types and runs `chooseClientAlias` only once.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  reorg src, new test case

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5257/files
  - new: https://git.openjdk.java.net/jdk/pull/5257/files/ffd792f0..694052c4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5257&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5257&range=00-01

  Stats: 330 lines in 5 files changed: 25 ins; 237 del; 68 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5257.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5257/head:pull/5257

PR: https://git.openjdk.java.net/jdk/pull/5257