Update selection of report-iterative test sets

Update selection of report-iterative test sets

- Create the same directory structure for report-iterative as it is
  for report-coverage.
- Move files from report-iterative directory to created sub-directories.
- Rename the moved files to keep the convention defined in
  report-coverage.
- Update the corresponding functionality in
  resources/libraries/bash/function/common.sh

The patches:
- https://gerrit.fd.io/r/c/csit/+/27486
- https://gerrit.fd.io/r/c/csit/+/27484
- https://gerrit.fd.io/r/c/csit/+/27485
must be updated.

Change-Id: I1aaf22690e3df5abf56893bb1d2d380debc54ddd
Signed-off-by: Tibor Frank <tifrank@cisco.com>