slapos_web_deploy: install python2 even on newest OS

actually ansible uses /usr/bin/python as defaut interpreter. Use this
temporary workaround until we can set properly the ansible python
interpreter. See https://docs.ansible.com/ansible/latest/reference_appendices/python_3_support.html

master/bt5/slapos_web_deploy/PathTemplateItem/web_page_module/deploy_base_setup.txt

@@ -131,6 +131,8 @@ if ! is_ubuntu || [[ $DISTRO = wheezy || $DISTRO == jessie || $DISTRO == stretch
 else
   # Ansible is using python3 now
   is_package_installed python3-pip || install_package python3-pip
+  # XXXX install python2 until we can properly set ansible python interpreter
+  is_package_installed python || install_package python
 fi
 
 if is_fedora && [[ $DISTRO == "f26" ]]; then