Pin virtualbmc to <2 when using Python 2

This is necessary until we drop support for CentOS 7.

Also use Train upper constraints with Python 2, since Train is the last
release to support Python 2.

Change-Id: I085d107ae2d338a7609dececb7b62555937b7b1e

ansible/group_vars/all

@@ -6,4 +6,4 @@ virtualenv_path: "{{ '/'.join([ansible_env['HOME'], 'tenks-venv']) }}"
 # The URL of the upper constraints file to pass to pip when installing Python
 # packages.
 python_upper_constraints_url: >-
-  https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt
+  https://releases.openstack.org/constraints/upper/{% if ansible_python.version.major == 2 %}train{% else %}master{% endif %}

ansible/roles/virtualbmc-daemon/files/requirements.txt

@@ -1,4 +0,0 @@
-# This file contains the Python packages that are needed in the Tenks virtual
-# env.
-
-virtualbmc>=1.4.0 # Apache

ansible/roles/virtualbmc-daemon/tasks/main.yml

@@ -18,19 +18,10 @@
   retries: 3
   become: true
 
-# This is useful to get a uniquely generated temporary path.
-- name: Create temporary file for pip requirements
-  tempfile:
-  register: req_file
-
-- name: Copy requirements file to temporary location
-  copy:
-    src: requirements.txt
-    dest: "{{ req_file.path }}"
-
 - name: Ensure Python requirements are installed
   pip:
-    requirements: "{{ req_file.path }}"
+    name:
+      - "virtualbmc>=1.4.0{% if ansible_python.version.major == 2 %},<2{% endif %}"
     extra_args: >-
       -c {{ vbmcd_python_upper_constraints_url }}
     virtualenv: "{{ vbmcd_virtualenv_path or omit }}"

zuul.d/jobs.yaml

@@ -11,6 +11,9 @@
     name: tenks-deploy-teardown-centos
     parent: tenks-deploy-teardown-base
     nodeset: centos-7
+    required-projects:
+      - name: openstack/requirements
+        override-checkout: stable/train
 
 - job:
     name: tenks-deploy-teardown-ubuntu

zuul.d/project.yaml

@@ -13,7 +13,8 @@
         - tenks-deploy-teardown-ubuntu
         # Until we have ironic jobs using tenks, gate on the kayobe overcloud
         # deploy job, which uses tenks to test bare metal compute provisioning.
-        - kayobe-overcloud-centos
+        # FIXME(mgoddard): Kayobe CentOS 7 jobs no longer working. Replace with C8.
+        # - kayobe-overcloud-centos
     gate:
       queue: tenks
       jobs:
@@ -22,4 +23,5 @@
         - tenks-deploy-teardown-ubuntu
         # Until we have ironic jobs using tenks, gate on the kayobe overcloud
         # deploy job, which uses tenks to test bare metal compute provisioning.
-        - kayobe-overcloud-centos
+        # FIXME(mgoddard): Kayobe CentOS 7 jobs no longer working. Replace with C8.
+        # - kayobe-overcloud-centos