[jdk17u] RFR: 8251329: (zipfs) Files.walkFileTree walks infinitely if zip has dir named "." inside

[Ravi Reddy]

Clean backport of https://orahub.oci.oraclecorp.com/jpg-sec/jdk-cpu-open/commit/3e3051e2ee93142983e9a3edee038e4f7b5ac0f2

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Commit messages:
 - 8251329: (zipfs) Files.walkFileTree walks infinitely if zip has dir named "." inside

Changes: https://git.openjdk.java.net/jdk17u/pull/210/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=210&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251329
  Stats: 201 lines in 3 files changed: 200 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/210.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/210/head:pull/210

PR: https://git.openjdk.java.net/jdk17u/pull/210