8342609: jpackage test helper function incorrectly removes a directory instead of its contents only

[alexeysemenyukoracle]

Files.walk(root, 0) returns the root itself and not the contents of the root.
Replaced Files.walk(root, 0) with Files.list(root) to get a non-recursive listing of the root directory.

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 ⚠️ Found leading lowercase letter in issue title for 8342609: jpackage test helper function incorrectly removes a directory instead of its contents only

Issue

• JDK-8342609: jpackage test helper function incorrectly removes a directory instead of its contents only (Bug - P4)

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[mlbridge]

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• 00: Full (e7b95550)

[sashamatveev]

Looks good, but can you make issue title more descriptive of the issue.