[ACS4.4] cherry-pick 08ec6ebddaf5a5cddab2be8dfcebf75b91dafa92

[Rajani Karuturi]

Hi Daan,
Can you cherry-pick the below commit from 4.4-forward to 4.4?

Commit: 08ec6ebddaf5a5cddab2be8dfcebf75b91dafa92 Fixed CLOUDSTACK-6509 Cannot 
import multiple LDAP/AD users into a cloudstack account


~Rajani