Clear report_data on each host report

## Verification

 - [x] Grab a recent Foundstone Network Inventory XML report
 - [x] Create a test workspace.
 - [x] Edit the xml to add a service on the first host that is unique to that host. E.g., remove any <Service /> with <Port>22</Port> except for on the first.

### Expected result:

Before the fix, you will see the same unique service added to every host.

After the fix, that unique service will stick to that one host (as you'd expect)