RFR: 8231107: Allow store password to be null when saving a PKCS12 KeyStore

[Sean Mullan]

On Thu, 14 Oct 2021 14:43:32 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> You can create a password-less PKCS12 KeyStore file now by calling `ks.store(outStream, null)` no matter what the default cert protection algorithm and Mac algorithm are defined in `java.security`.
> 
> Note: the system properties set in `ToolsJDK.gmk` to generate `cacerts` must be retained (at the moment) because the tool is launched with BOOT_JDK.

Marked as reviewed by mullan (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5950