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

[David Holmes]

On Fri, 15 Jul 2022 16:46:43 GMT, Bill Huang <duke at openjdk.org> wrote:

> The other question is should we include Solaris as it is also unix based.

@bwhuang-us there is no Solaris support in mainline.

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