Description of problem:
reports using "group by" on date show a total column per vm instead of showing a total at the end of the report

Version-Release number of selected component (if applicable):
5.8.2

How reproducible:
all the time

Steps to Reproduce:
1. create a report per tenant grouping by date
2. generate a report
3. display it

Actual results:
there is a "total" line per vm 

Expected results:
there is only one total at the end

Additional info:
screenshots from the customer available. This behaviour is new, Cloudforms 4.2 used to display the total at the end only. 
if this is not a bug will go for a feature request to change the 4.8 behaviour with an option.