Fix rtd requirement order
Fix rtd requirement order

Change-Id: Ie2fbd978ed0bb9772d66eb367f1bdad32c5afd61
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,opnfv/functest