RFR: 8279254: PKCS9Attribute SigningTime always encoded in UTFTime [v3]

[Ben Perez]

> Added single-argument `putTime` method to `DerOutputStream` that selects the correct encoding based on the `Date` value. Similarly, a `getTime` method was added to `DerValue` to automatically call the correct decoding function based on the date type specified by the `tag`. Furthermore, the `encode` method in `PKCS9Attribute` was changed to utilize the new `putTime` method.

Ben Perez has updated the pull request incrementally with two additional commits since the last revision:

 - Fixed epoch literals to be in milliseconds
 - Updated copyright in DerInputStream

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14617/files
  - new: https://git.openjdk.org/jdk/pull/14617/files/bb95533d..fad36da0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14617&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14617&range=01-02

  Stats: 5 lines in 3 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/14617.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14617/head:pull/14617

PR: https://git.openjdk.org/jdk/pull/14617