RFR: 8273961: jdk/nio/zipfs/ZipFSTester.java fails if file path contains '+' character [v3]

[Remilia Scarlet]

> Add the pre-processing to replace "+" by "%2b" which avoids `URLDecoder.decoder` changing the path unexpectedly.
> 
> Please review this change. Thanks!

Remilia Scarlet has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8273961: jdk/nio/zipfs/ZipFSTester.java fails if file path contains '+' character

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5574/files
  - new: https://git.openjdk.java.net/jdk/pull/5574/files/4e07d675..be7c1fdf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5574&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5574&range=01-02

  Stats: 8 lines in 1 file changed: 1 ins; 4 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5574.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5574/head:pull/5574

PR: https://git.openjdk.java.net/jdk/pull/5574