Description of problem:
Cant tell between two labels an entity might have in a report.
if the entity has 2 labels, one: {section:'labels 'name: 'test' value:'1'}
and two: {section:'docker_labels 'name: 'test' value:'2'} you cant add one label but not the other to the report or know which one is which


Version-Release number of selected component (if applicable):
5.7.0

How reproducible:
Create a new report based on an entity with 2 types of custom attributes(labels) 
(for example Container Image) and try to add one type of label and not the other

Steps to Reproduce:
1. Cloud Intel -> reports -> create new report
2. Base report on 'Container Image'
3. Have a look at the custom attribute columns in the selectable columns list

Actual results:
Cannot distinguish between labels from different ssections

Expected results:
Have some sort of indicator to which section each label column belongs to

Additional info: