Select ansible 2.3.2.0
Select ansible 2.3.2.0

Badly the ansible version is not defined in OpenStack's
upper-constaints.txt. It must be added in the OPNFV one.

Otherwise, rally fails [1]

[1] https://build.opnfv.org/ci/job/functest-fuel-baremetal-daily-master/1866/console

Change-Id: Id6814376ce96d35db65f6290d0a31283a15de0b2
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

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