RFR: 8321396: Retire test/jdk/java/util/zip/NoExtensionSignature.java

[Eirik Bjorsnos]

Please review this PR which suggests we retire the ZIP test `NoExtensionSignature` along with its `test.jar` test vector. 

The concern of a missing data descriptor signature is covered by the recently updated  `DataDescriptorSignatureMissing` test. That test is more complete, includes more documentation and uses a programmatically generated test vector.

One might argue that 'more tests are always better', but in this case I think the 21 year old `NoExtensionSignature` test with its binary test vector is nebulous and requires extensive analysis to understand, more so to update. I think it does not carry its weight and should be retired.

Careful analysis of the deleted `test.jar` test vector revealed that it contains a local header with non-zero `compressed size` and `uncompressed size` fields for a streaming-mode entry. `APPNOTE.TXT` mandates that when bit 3 of the general purpose bit flag is set, then these fields and the `crc` field should all be set to zero. 

By injecting assertions into `ZipInputStream.readLOC` I was able to determine that `NoExtensionSignature` is the only test currently parsing a ZIP file with such non-zero fields in streaming mode. 

Because of this, and out of caution, this PR introduces a new test `DataDescriptorIgnoreCrcAndSizeFields` which  explicitly verifies that `ZipInputStream` does not read any non-zero `crc`, `compressed size` and `uncompressed size` field values from a local header when in streaming mode. `ZipInputStream` should ignore these values and it would be good to have a test which asserts that this invariant holds even when the fields are non-zero.

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Commit messages:
 - Rename 'nameAndContent' parameter to 'expected'
 - Retire the test NoExtensionSignature in favor of DataDescriptorSignatureMissing. Introduce the new test DataDescriptorIgnoreCrcAndSizeFields covering unrelated aspects implicitly tested by NoExtensionSignature.

Changes: https://git.openjdk.org/jdk/pull/16975/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16975&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321396
  Stats: 222 lines in 3 files changed: 180 ins; 42 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16975.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16975/head:pull/16975

PR: https://git.openjdk.org/jdk/pull/16975