Update xtesting to 0.87.0
Update xtesting to 0.87.0

Change-Id: I0ee3499cf9c78687825714c00c1cf18ed2a70456
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,opnfv/functest