RFR: 8290180: Convert com/sun/management/UnixOperatingSystemMXBean/GetOpenFileDescriptorCount.sh to jtreg java version [v2]

[Bill Huang]

On Thu, 14 Jul 2022 22:46:09 GMT, Bill Huang <duke at openjdk.org> wrote:

>> This is a task to convert shell tests to Java tests. The shell scripts to be removed are responsible for compiling Java files and running the tests on Linux systems. This functionality can be achieved with JTReg tag @requires (os.family=="linux").
>
> Bill Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed othervm option and fixed @requires coding style.

It is not out of scope. I can do the clean up along with this PR. Can you please give me some hints what could be optimized?

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PR: https://git.openjdk.org/jdk/pull/9503