temporary switch of opnfv/functest-* to ollivier/functest-* for alpine

temporary switch of opnfv/functest-* to ollivier/functest-* for alpine

 - better requirement management on ollivier docker hub
 - add feature and vnf docker (components could be added but as they could be
 very long (~ > 3h), we focus on shorter tests for the moment (need testcase
promotion mechanism to keep the control on overall test duration)

Change-Id: Ia8130dba716a465cd9feaaac32eabb4534cbe031
Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>