Assure pyyaml is installed before running sova test

Avoids failure when ansible was running inside a virtualenv due to
unavailability of --user mode. In the future sova test should be
switched to a container instead of delegated as delegated is testing
compatibility build build node used by tox (bionic), under a tox
virtualenv, something that diverge considerably from production use.

Change-Id: Idd79b493fe9f6d37005484239e532793a06ea356

bindep.txt

@@ -0,0 +1 @@
+python3-yaml [platform:ubuntu]

molecule/sova/molecule.yml

@@ -15,6 +15,7 @@ provisioner:
   name: ansible
   config_options:
     defaults:
+      interpreter_python: auto
       timeout: 30
       forks: 500
   inventory:

molecule/sova/prepare.yml

@@ -3,11 +3,6 @@
   hosts: all
   tasks:
 
-    - name: Install python YAML module
-      pip:
-        name: pyyaml
-        extra_args: --user
-
     - name: Prepare the console file directory
       file:
         path: '{{ ansible_user_dir }}/workspace/logs/'

tox.ini

@@ -62,6 +62,7 @@ deps =
     pytest-html  # MPL 2.0
     pytest-molecule>=1.2.4  # MIT
     pytest-xdist
+    pyyaml
     selinux>=0.2.1  # MIT
 commands =
     python -m pytest --color=yes --html={envlogdir}/reports.html --self-contained-html {tty:-s} {posargs}