[jdk13u-dev] RFR: 8225082: Remove IdenTrust certificate that is expiring in September 2021

[Yuri Nesterenko]

Remove expired certificate identrustdstx3. There is a replacement. Test failed before and well, not failed on this certificate but there will be another fix, to JDK-8225083, to make it pass. A last chunk in the test change was removed so it is not exactly clean port.

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Commit messages:
 - Backport 2ec45dc2dd3a6bcb4f68ee7cde5858d63614305a

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/276/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=276&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8225082
  Stats: 32 lines in 2 files changed: 0 ins; 29 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/276.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/276/head:pull/276

PR: https://git.openjdk.java.net/jdk13u-dev/pull/276