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

[Roger Riggs]

> 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

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2006/files
  - new: https://git.openjdk.java.net/jdk/pull/2006/files/c437a74b..b6908530

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2006&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2006&range=00-01

  Stats: 43 lines in 43 files changed: 0 ins; 0 del; 43 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2006.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2006/head:pull/2006

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