Description of problem:
chargeback reports based on vms with tags show incorrect values for cpus and memory fixed costs

Version-Release number of selected component (if applicable):
5.9.2.4-3 (hotfix previously released)

How reproducible:
all the time

Steps to Reproduce:
1. set up cloudforms environment with rhev & data collection & an associated tag used for a test vm
2. create a chargeback compute rate based on "additional info" details
3. assign the rates to a tag used 
4. generate a report

Actual results:
for cpu, the cost computed is 0
for memory, the cost is based on 1gb instead of 16.

Expected results:
for 4 vcpus the charge is 4 times the fixed cost per cpu
for memory the cost is computed correctly, per memory per month

Additional info:
the chargeback is based on default with the following costs set :
- allocated cpu cores : 1000 Eur / month / cpu core
- allocated memory : 10 Eur / month / GB

the vm used in tests had 4cpus and 16384 MB ram