RFR: 8300140: ZipFile.isSignatureRelated returns true for files in META-INF subdirectories [v15]

[Eirik Bjorsnos]

> Some call sites of SignatureFileVerifier.isBlockOrSF fails to check that files reside in META-INF directly, and not in a subdirectory of META-INF.
> 
> The mentioned call sites needs updates to check and ignore such files.
> 
> A new test IgnoreUnrelatedSignatureFiles is added which verifies that [*.SF, *.RSA] files in META-INF/ subdirectories are indeed ignored.

Eirik Bjorsnos has updated the pull request incrementally with one additional commit since the last revision:

  Add whitespace after keywords if and for

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11976/files
  - new: https://git.openjdk.org/jdk/pull/11976/files/cf93bfc1..408d2228

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11976&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11976&range=13-14

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11976.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11976/head:pull/11976

PR: https://git.openjdk.org/jdk/pull/11976