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

[Bill Huang]

On Fri, 15 Jul 2022 01:56:39 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Bill Huang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Removed othervm option and fixed @requires coding style.
>
> Is the restriction to run on Linux actually still valid? Shouldn't this work on any of our Posix-like  platforms? I suspect you need to read "Linux" as "not Solaris or Windows" when looking at this test (and possibly others).

@dholmes-ora I agreed. These tests should be working on any unix-based system. I can change the restriction to be not Windows. The other question is should we include Solaris as it is also unix based.

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