Failed to upload results to ONAP portal

Failed to upload results to ONAP portal

The results.json file generated by running
'dovetail run --testsuite xxx' is different from the one
generated by running 'dovetail run --testcase xxx'.
The former can be uploaded to ONAP portal successfully
but the latter one can't.
The main reason is that the latter one lacking of 'vnf_type'.
Keep the results.json with the same format for both running
one test suite or several test cases.

JIRA: DOVETAIL-769

Change-Id: I46af84f9f229f9e601439f68c9ed9df9477d002b
Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>