Add downstream upper-constraints ENV variable

Bifrost and Kolla-toolbox needs override as their build
process is different to other Kolla images.

Author: seunghun1ee

etc/kayobe/kolla.yml

@@ -320,7 +320,6 @@ kolla_build_blocks:
     ENV UPPER_CONSTRAINTS_FILE=https://raw.githubusercontent.com/stackhpc/requirements/stackhpc/{{ openstack_release }}/upper-constraints.txt
   bifrost_base_header: |
     ADD additions-archive /
-    ENV ANSIBLE_PIP_VERSION='>=8,<9'
     ENV TOX_CONSTRAINTS_FILE=/requirements/upper-constraints.txt
   grafana_plugins_install: |
     RUN grafana-cli plugins install vonage-status-panel \