Report duration and result when vping fails
Report duration and result when vping fails

It completes "Bug fix: vping_userdata test status was not properly
reported" [1].

[1] https://gerrit.opnfv.org/gerrit/#/c/43911/

Change-Id: I7e8be6cd564a24ca174e63cfc295861c51cae8ed
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

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