[ACS44]cherry pick CLOUDSTACK-6443

[Min Chen]

Hi Hugo/Daan,

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

        Commit: ef2616bfda1b37887312a93068937f5ecfaa36b4
        CLOUDSTACK-6443: [Automation] Two Test Cases failed on "test_volumes.py"
- AttributeError: VirtualMachine instance has no attribute 'hosted'.

        Thanks
        -min