Update .travis.yml

.travis.yml

@@ -7,13 +7,21 @@ addons:
     sources:
       - sourceline: ppa:ansible/ansible
     packages:
+#      - python-pip    # @arky had used this starting in 2018
       - ansible-base    # Install latest ansible-base e.g. 2.10.6+, similar to https://github.com/iiab/iiab/blob/master/scripts/ansible
-#      - python-pip
+#      - python3-pymysql    # These 7-or-8 packages are not needed during this very rapid --syntax-check
+#      - python3-psycopg2
+#      - python3-passlib
+#      - python3-pip
+#      - python3-setuptools
+      - python3-packaging    # To avoid warning "packaging Python module unavailable; unable to validate collection..."
+#      - python3-venv
+#      - virtualenv
 
 install:
 #  - scripts/ansible    # See #2105: fails to install latest Ansible (& ~4 Ansible Collections from collections.yml) due to Travis VM's disk layout/perms being different
 #  - pip install ansible    # SLOW/OVERWEIGHT: installs Ansible 3.0.0+ with ~80 Ansible Collections
-#  - pip install ansible-base    # Install latest ansible-base e.g. 2.10.6+, similar to https://github.com/iiab/iiab/blob/master/scripts/ansible
+#  - pip install ansible-base    # ALSO WORKS e.g. if the above addons: / apt: section is commented out.  To install latest ansible-base e.g. 2.10.6+, similar to https://github.com/iiab/iiab/blob/master/scripts/ansible
   - ansible-galaxy collection install -r collections.yml    # Install ~4 Ansible Collections
   - "{ echo 'roles_path = ./roles/'; } >> ansible.cfg"    # Add correct roles_path to ansible.cfg, appending to https://github.com/iiab/iiab/blob/master/ansible.cfg
 #  - "{ echo '[defaults]'; echo 'roles_path = ./roles/'; } >> ansible.cfg"    # Create ansible.cfg with correct roles_path and local_tmp