Description of problem:
When I create a user and add it to EvmGroup-super_administrator group, I can't remove it via tree. 
Configuration->Delete this User button is grayed out for all users belonging to EvmGroup-super_administrator group. Although, those users can be easily removed thru "Access Control EVM Users" page.

I suppose this bug is result of fix BZ 1090877.
Additionally, "Delete this User" menu item always shows a tooltip for "Administrator" user (see screenshot).


Version-Release number of selected component (if applicable):
5.7.0.17

How reproducible:
100%

Steps to Reproduce:
1. Go to Configuration->Access Control->Users page
2. Create a user and add it to EvmGroup-super_administrator group by clicking Configuration->Add a new User and filling appropriate fields
2. Find this just created user in the Access Control tree and select it
3. Try to click Configuration -> Delete this User 

Actual results:
Delete this User menu item is grayed out and shows tooltip for "Administrator" account.

Expected results:
It should be possible to remove such accounts except currently logged in account.

Additional info: