Stop using pre-compiled wheels

We actually want to ensure users are able to use our roles outside of
openstack-infra. Since those users won't have wheel mirrors, disable
our jobs from using them too.

Change-Id: I0a3c44c81aff497bc1678b68fc7b1374f233901b
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -1,5 +1,6 @@
 - job:
     name: ansible-role-nodepool-base
+    pre-run: tests/playbooks/pre.yaml
     run: tests/playbooks/run.yaml
     post-run: tests/collect-logs.yaml
     roles:

tests/playbooks/pre.yaml

@@ -0,0 +1,9 @@
+- hosts: all
+  tasks:
+    - name: Disable extra wheels mirror
+      become: yes
+      lineinfile:
+        dest: /etc/pip.conf
+        regexp: ^extra-index-url
+        state: absent
+