Space creator have full admin access to the space and can remove the admin from that space

Steps to reproduce:

• Login as a normal user without any admin rights.
• Create a Confluence space.-
• Go to the space permissions, and edit the permissions to remove the Administrators group.

Now the user who created that space have full access, and the admin have no other way to gain access to that space anymore, except for confluence-administrator. This affects OnDemand in a big way, as no confluence-administrator is available for users.