RFR: 8285452: Support new API to replace a file content using FileUtils.java [v3]

[Roger Riggs]

On Fri, 22 Apr 2022 14:35:14 GMT, Sibabrata Sahoo <ssahoo at openjdk.org> wrote:

>> A new API to support replacing selective lines with desired content.
>
> Sibabrata Sahoo has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update FileUtils.java

Please change the issue/pr title to indicate it is a new API in the **test** library.
The problem with single purpose APIs with not enough forethought is that they are not discoverable
in the library and fall into disuse or are not appropriate for someone else to find and use.

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PR: https://git.openjdk.java.net/jdk/pull/8360