use aix stats implementation for hpux as well

[Anirudh-Gupta]

Added test for aix stats.

[chris-rock]

@Anirudh-Gupta thanks. I am going to fix the tests on appveyor. Once I've done it, lets rebase this PR and merge.

[chris-rock]

@Anirudh-Gupta I fixed the tests, could you please rebase on the latest master? That should give you a green light.

[chef-supermarket]

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[chef-supermarket]

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[Anirudh-Gupta]

@chris-rock : rebased it to latest master.

[chris-rock]

Thanks @Anirudh-Gupta