[ACS4.4] Cherry-pick da5ad74d5f4388c4aa1df2f2e5f9053bfb70d83d

[Min Chen]

Hi Daan,

        Would you please cherry-pick the following commit from 4.4-forward to 
4.4?

        Commit: da5ad74d5f4388c4aa1df2f2e5f9053bfb70d83d
        CLOUDSTACK-6752: IAM command class separation caused ApiDoc warning of
duplicated cmd class for the same api name.

        Thanks
        -min