RFR: 8295068: SSLEngine throws NPE parsing CertificateRequests [v2]

[Kevin Driver]

> JDK-8295068: an NPE is thrown when an invalid `id` is found to match up a `ClientCertificateType`; rather than throwing the `NPE`, we now throw an `IllegalArgumentException`. This does not seem to be a scenario where recovery is possible or desired, so the `IAE` should be the proper behavior.

Kevin Driver has updated the pull request incrementally with two additional commits since the last revision:

 - remove extra line break
 - fail to look up the id silently to not throw an unexpected error

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14778/files
  - new: https://git.openjdk.org/jdk/pull/14778/files/d36df7ba..ce669848

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14778&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14778&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14778.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14778/head:pull/14778

PR: https://git.openjdk.org/jdk/pull/14778