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

Thu Jul 14 22:51:05 UTC 2022

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.

There are some possible cleanups in the tests (comments, unused args, variable name style) but seem out of scope for this PR.

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