RFR: 8262186: Call X509KeyManager.chooseClientAlias once for all key types [v4]

[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:

  rename one variable

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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/3b6a01db..3968467d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5257&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5257&range=02-03

  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 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