Use upper constraints in tox installs
Use upper constraints in tox installs

Openstack infra now supports upper constraints for all jobs.
This patch adds upper constaints for test environment setup.

Change-Id: I86312653e2b044e7180a9201addd48b29aa61bba
Closes-Bug: #1596246

openstack/manila-ui,openstack/manila-ui,openstack/manila-ui