[ACS4.4] cherry pick commit e7e1ae254af8588a90bee56f5dcd1175c64ffd5e

[Sanjay Tripathi]

Hi Hugo/Daan,

Could you please cherry-pick following commit to 4.4 branch.

Commit: e7e1ae254af8588a90bee56f5dcd1175c64ffd5e

CLOUDSTACK-6649: CS is not giving the system-wide capacity for GPU reosurce.

--Sanjay