[ACS4.4] Cherry-pick 0d243ec7f2e1a0e3508d385f7b793b103c56ca07

[Min Chen]

Hi Daan,

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

Commit: 0d243ec7f2e1a0e3508d385f7b793b103c56ca07
CLOUDSTACK-6745:DomainAdmin is not able to deploy Vm for users in his 
domain/subdomain.

Thanks
-min