RFR: 8258796: [test] Apply HexFormat to tests for java.security [v2]

[Xue-Lei Andrew Fan]

On Fri, 8 Jan 2021 16:26:09 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Followup to the addition of java.util.HexFormat.  
>> Uses of adhoc hexadecimal conversions are replaced with HexFormat.
>> Redundant utility methods are modified or removed.
>> In a few places the data being printed is ASN.1 and the test utility HexPrinter with the ASNFormatter is added.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyrights to 2021

Looks good to me.  Thank you!

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Marked as reviewed by xuelei (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2006