Fix molecule jobs after release of cryptography3.4

Molecule jobs[0] fails with below error:-

ModuleNotFoundError: No module named 'setuptools_rust'

This error appeared following the release of cryptography 3.4, which
now includes Rust code. It can be installed without Rust using a
Python wheel, but only with more recent pip than version 9.0.3
available as RPM on CentOS 8.

The cryptography bug report [1] recommends pip>=19.1.1.

[0] https://e99635be2c7386b5beda-3dea60a35fb0d38e41c535f13b48e895.ssl.cf1.rackcdn.com/773531/1/gate/tripleo-ansible-centos-8-molecule-tripleo_network_config/b1284cd/job-output.txt
[1] https://github.com/pyca/cryptography/issues/5753
Related-Bug: #1915101

Change-Id: Ib5baad39dd7e43dff9046178c00b0f836dc18bae

ci/playbooks/pre.yml

@@ -32,6 +32,12 @@
       become: true
       changed_when: false
 
+    - name: Ensure a recent version of pip is installed in virtualenv
+      pip:
+        name: "pip>=19.1.1"
+        virtualenv: "{{ ansible_user_dir }}/test-python"
+        virtualenv_command: "{{ ensure_pip_virtualenv_command }}"
+
     - name: Setup test-python
       pip:
         requirements: "{{ tripleo_validations_project_path }}/molecule-requirements.txt"

scripts/run-local-test

@@ -48,7 +48,7 @@ sudo touch /etc/ci/mirror_info.sh
 "${PYTHON_EXEC}" -m virtualenv --system-site-packages "${HOME}/test-python"
 
 # Run bindep
-"${HOME}/test-python/bin/pip" install pip setuptools bindep --upgrade
+"${HOME}/test-python/bin/pip" install "pip>=19.1.1" setuptools bindep --upgrade
 "${PROJECT_DIR}/scripts/bindep-install"
 
 # Install local requirements