[CI] Add no-infra-wheels jobs

Since Kolla is run in the wild against PyPI mirrors which do not
include the OpenDev-provided wheels, it might be nice to be able
to test these scenarios in the CI.

These jobs are added to the experimental queue so that they do
not consume resources when not needed.
Any Gerrit user may run them now to verify whether the change
passes them.

Change-Id: I9c33eeaf03be037651f82c831f0e07ab9a27752a

.zuul.d/base.yaml

@@ -90,3 +90,9 @@
       kolla_logs_dir: "{{ zuul_output_dir }}/logs/kolla"
       kolla_build_logs_dir: "{{ kolla_logs_dir }}/build"
       virtualenv_path: "/tmp/kolla-virtualenv"
+
+- job:
+    name: kolla-build-no-infra-wheels-base
+    parent: kolla-base
+    vars:
+      use_infra_wheels_mirror: false

.zuul.d/centos.yaml

@@ -57,6 +57,9 @@
       jobs:
         - kolla-publish-centos8-source
         - kolla-publish-centos8-binary
+    experimental:
+      jobs:
+        - kolla-build-no-infra-wheels-centos8-source
 
 - job:
     name: kolla-build-centos8-binary
@@ -98,3 +101,11 @@
       publisher: true
     secrets:
       - kolla_dockerhub_creds
+
+- job:
+    name: kolla-build-no-infra-wheels-centos8-source
+    parent: kolla-build-no-infra-wheels-base
+    nodeset: kolla-centos8
+    vars:
+      base_distro: centos
+      install_type: source

.zuul.d/debian.yaml

@@ -18,6 +18,9 @@
         - kolla-publish-debian-source
         - kolla-publish-debian-source-aarch64
         - kolla-publish-debian-binary
+    experimental:
+      jobs:
+        - kolla-build-no-infra-wheels-debian-source
 
 - job:
     name: kolla-build-debian-source
@@ -64,3 +67,11 @@
     name: kolla-publish-debian-source-aarch64
     parent: kolla-publish-debian-source
     nodeset: kolla-debian-buster-aarch64
+
+- job:
+    name: kolla-build-no-infra-wheels-debian-source
+    parent: kolla-build-no-infra-wheels-base
+    nodeset: kolla-debian-buster
+    vars:
+      base_distro: debian
+      install_type: source

.zuul.d/ubuntu.yaml

@@ -79,6 +79,9 @@
       jobs:
         - kolla-publish-ubuntu-source
         - kolla-publish-ubuntu-binary
+    experimental:
+      jobs:
+        - kolla-build-no-infra-wheels-ubuntu-source
 
 - job:
     name: kolla-build-ubuntu-binary
@@ -120,3 +123,11 @@
       publisher: true
     secrets:
       - kolla_dockerhub_creds
+
+- job:
+    name: kolla-build-no-infra-wheels-ubuntu-source
+    parent: kolla-build-no-infra-wheels-base
+    nodeset: kolla-ubuntu-focal
+    vars:
+      base_distro: ubuntu
+      install_type: source

tests/templates/template_overrides.j2

@@ -6,7 +6,9 @@
 
 ENV PIP_INDEX_URL {{ nodepool_pypi_mirror }}
 ENV PIP_TRUSTED_HOST {{ nodepool_mirror_host }}
+{% if use_infra_wheels_mirror | default(true) %}
 ENV PIP_EXTRA_INDEX_URL {{ nodepool_wheel_mirror }}
+{% endif %}
 
 RUN echo registry={{ nodepool_npmjs_proxy }} > /etc/npmrc \
     && mkdir -p /usr/etc \