Work around bad libvirt-python wheel

The following package must always build from source:

- libvirt-python:
  A pre-built wheel can be missing libvirt capabilities
  from the installed version of libvirt-bin, leading to
  nova-compute failing to start.

The pycparser upper constraint override is removed as
the patch to make it compatible with upper constraints
has merged.

Closes-Bug: #1625859
Change-Id: I3197f06839c9705574810ab616dff51924435da5
(cherry picked from commit faf78e457e)

playbooks/inventory/group_vars/repo_all.yml

@@ -45,3 +45,12 @@ repo_build_service_group_name: "{{ repo_service_group_name }}"
 
 # Disable the pip lock down for the repo servers
 pip_lock_to_internal_repo: False
+
+# The following package must always build from source.
+#
+# libvirt-python:
+# A pre-built wheel can be missing libvirt capabilities from the installed
+# version of libvirt-bin, leading to nova-compute failing to start.
+#
+repo_build_pip_no_binary:
+  - libvirt-python

tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2

@@ -81,10 +81,6 @@ cache_timeout: {{ cache_timeout }}
 repo_build_git_cache: {{ repo_build_git_cache }}
 {% endif %}
 
-## Instruct the gate to always build libvirt-python from pip source
-repo_build_pip_no_binary:
-  - libvirt-python
-
 # The container backing store is set to 'overlayfs' to speed up the
 # AIO build time.
 lxc_container_backing_store: "{{ ((ansible_kernel | version_compare('3.18.0-0-generic', '<')) or (ansible_distribution_release | lower == 'trusty')) | ternary('dir', 'overlayfs') }}"