[RELEASE] Fix Openstack and OPNFV upper constraints versions

[RELEASE] Fix Openstack and OPNFV upper constraints versions

The robot pods is old..due to historical reasons.
that is why we created a robot-p3 for new tests.
However it shall still be compiled for our needs

The upper constraints were so far set to master, which is not very good
as xtesting was set to jerma.

Setting version for Openstack and OPNFV upper constraints
shall fix teh python dependency issue preventing from releasing
the istanbul xtesting dockers

Issue-ID: INT-2006

Signed-off-by: morganrol <morgan.richomme@orange.com>
Change-Id: I7226da28fe76891c1be4a9bd5b391fe2e7a52247