RFR: 8325766: Review seclibs tests for cert expiry [v6]

[Matthew Donovan]

> This PR updates the CertificateBuilder with a new method that creates a new instance with common fields (subject name, public key, serial number, validity, and key uses) filled-in. One test, IPIdentities.java, is updated to show how the method can be used to create various certificates. I attached screenshots that compare the old hard-coded certificates (left) with the new generated certificates.
> 
> ![trusted-cert](https://github.com/user-attachments/assets/4bfaca10-74f3-4d24-9796-288358ae00e1)
> ![server-cert](https://github.com/user-attachments/assets/51ce8ed2-0784-44ab-96a1-9d0a2ea66aaa)
> ![client-cert](https://github.com/user-attachments/assets/5090a71e-ef7a-4303-ae1a-78f89878d1c0)

Matthew Donovan has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - changed keystore to PKCS12 and remove key initialization
 - added new method, setOneHourValidity(), and removed it from the static method.
 - Merge branch 'master' into certbuilder
 - fixed redundant setNotAfter() calls. One of them should have been setNotBefore
 - Merge branch 'master' into certbuilder
 - expanded wildcard imports
 - Merge branch 'master' into certbuilder
 - Merge branch 'master' into certbuilder
 - reversed order of DN strings when making certificates.
 - Merge branch 'master' into certbuilder
 - ... and 5 more: https://git.openjdk.org/jdk/compare/011de4c8...963625db

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Changes: https://git.openjdk.org/jdk/pull/23700/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23700&range=05
  Stats: 789 lines in 3 files changed: 162 ins; 582 del; 45 mod
  Patch: https://git.openjdk.org/jdk/pull/23700.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23700/head:pull/23700

PR: https://git.openjdk.org/jdk/pull/23700