Do not build cryptography

Cryptography is shipping with wheels [1], and recent bugs for
dynamic linking in wheel building [2] should be fixed now.

We should therefore use the wheels.

[1]: https://pypi.org/project/cryptography/#files
[2]: https://github.com/pyca/cryptography/pull/3811

Change-Id: I1b7e1ee1e127569b488d7202ae601ee17701d3f0

inventory/group_vars/repo_all.yml

@@ -56,9 +56,10 @@ repo_build_service_group_name: "{{ repo_service_group_name }}"
 # see https://github.com/pyca/cryptography/issues/3804
 # This keeps popping up every now and then so it might worth keeping this
 # around even if the upstream issue is resolved
+# The upstream issue should be resolved now, and we are testing
+# cryptography with the usage of wheels by removing it from no_binary.
 repo_build_pip_no_binary:
   - libvirt-python
-  - cryptography
 
 # Set the build tag and the repo version
 repo_build_release_tag: "{{ openstack_release }}"