forget to clean push function in vPing
forget to clean push function in vPing

JIRA: FUNCTEST-36

Change-Id: I081cc04093bcc090748ccb5560b77559b328167f
Signed-off-by: Morgan Richomme <863ecccd07b4194c40ddc432b982c8c67e56599a@orange.com>

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