RFR: 8361711: Add library name configurability to PKCS11Test.java

[Thomas Fitzsimmons]

This patch adds configurability to `PKCS11Test.java`.

Specifically, it adds two new system properties:

- `CUSTOM_P11_LIBRARY_NAME`: Allow overriding the value assigned to the `nss_library` field.  Prior to this patch, `nss_library` was set to either `"softokn3"` or `"nss3"`.

- `CUSTOM_P11_CONFIG_VARIANT`: Abstract the configuration file type to load.  Prior to this patch, test cases that wanted to run `NSS` in sensitive mode would hard-code `p11-nss-sensitive.txt` on their command lines.

The patch updates the three `p11-nss-sensitive.txt`-using test cases to use the new `CUSTOM_P11_CONFIG_VARIANT` property:


test/jdk/java/security/KeyAgreement/Generic.java
test/jdk/sun/security/pkcs11/Mac/TestLargeSecretKeys.java
test/jdk/sun/security/pkcs11/rsa/TestP11KeyFactoryGetRSAKeySpec.java


I have been using this change to run `PKCS11Test.java` against the [Kryoptic](https://github.com/latchset/kryoptic) PKCS11 soft token, using this invocation:


make test \
    JTREG="JAVA_OPTIONS=-DCUSTOM_P11_CONFIG=/tmp/kryoptic-configuration/p11-kryoptic.txt \
                        -DCUSTOM_P11_LIBRARY_NAME=kryoptic_pkcs11 \
                        -Djdk.test.lib.artifacts.nsslib-linux_x64=/tmp/kryoptic-configuration \
                        -DCUSTOM_DB_DIR=/tmp/kryoptic-configuration"


`/tmp/kryoptic-configuration` contains (among other files):


libkryoptic_pkcs11.so
p11-kryoptic.txt
p11-kryoptic-sensitive.txt


With `CUSTOM_P11_LIBRARY_NAME` set, `PKCS11Test.java` can find `libkryoptic_pkcs11.so`.

And setting `CUSTOM_P11_CONFIG` causes the sensitive tests to use `p11-kryoptic-sensitive.txt` via the new `CUSTOM_P11_CONFIG_VARIANT` property.

On my `Fedora 42` `x86-64` machine, I tested for regressions with:

$ time make test JOBS=4 JTREG="JAVA_OPTIONS=-Djdk.test.lib.artifacts.nsslib-linux_x64=/usr/lib64" TEST="test/jdk/sun/security/pkcs11"

and:

$ time make test JOBS=4 TEST="test/jdk/sun/security/pkcs11"

-------------

Commit messages:
 - JDK-8361711: Add library name configurability to PKCS11Test.java

Changes: https://git.openjdk.org/jdk/pull/26325/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26325&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361711
  Stats: 14 lines in 4 files changed: 9 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/26325.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26325/head:pull/26325

PR: https://git.openjdk.org/jdk/pull/26325