bug fix: no status returned at the end of a Tempest/Rally run

bug fix: no status returned at the end of a Tempest/Rally run

the return shall only deal with test executed or not
it shall not return the criteria through a return statement
the criteria is managed with the criteria field
previous patch https://gerrit.opnfv.org/gerrit/#/c/27807
corrected the fact that we should not return the status of the test
which was preventing Failed results to be pushed
but it removed the return needed statement

JIRA: FUNCTEST-714

Change-Id: I3d4c609467837e4ce2353c67c0b8ea95e21ebd84
Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>