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

[Alex Menkov]

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.

Marked as reviewed by amenkov (Reviewer).

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