[ACS44] cherry pick CLOUDSTACK-6379

[Jessica Wang]

Hi Hugo/Daan,

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

Commit hash:    f4c726d7b842636e665ba4ca3616688e2b26192b

CLOUDSTACK-6379: UI:MS: Unable to create a user type Admin under a domain; No 
API being fired

Thanks,

Jessica