Return -1 in Rally if the success criteria is not met
Return -1 in Rally if the success criteria is not met

JIRA: FUNCTEST-382

Change-Id: Iaf475ecd3dbfcf6fb639ff146fe96e54c5393a1e
Signed-off-by: Markus Kullberg <f622f2e8b2024608cffa18d97b7d9b5712965f7d@nokia.com>

mywulin/functest,opnfv/functest,mywulin/functest,opnfv/functest