[jdk11u-dev] RFR: 8161536: sun/security/pkcs11/sslecc/ClientJSSEServerJSSE.java fails with ProviderException

[Amos Shi]

Backport of [JDK-8161536](https://bugs.openjdk.org/browse/JDK-8161536)
- This PR has two commits
- Commit 1 is a clean back port of original commit
- Commit 2 is the fix for test case error `ClassNotFoundException: allow`

Testing
- Local: Passed
- Pipeline: 
- Testing Machine:

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Commit messages:
 - 8161536 Fix [ClassNotFoundException: allow] error on java 11
 - Backport 939d7c5d8466f9e392beae2947a494ac28695cc1

Changes: https://git.openjdk.org/jdk11u-dev/pull/2521/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2521&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8161536
  Stats: 3 lines in 2 files changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2521.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2521/head:pull/2521

PR: https://git.openjdk.org/jdk11u-dev/pull/2521