Use the native python module to create virtual environments

Do this instead of using the 'virtualenv' command

Change-Id: I9fa8c3379d7f01486abdfb8c8264575328d2661e

tasks/python_venv_install.yml

@@ -53,15 +53,10 @@
     path: "{{ venv_install_destination_path | dirname }}"
     state: directory
 
-# NOTE(odyssey4me):
-# Not using --always-copy for CentOS due to
-# https://github.com/pypa/virtualenv/issues/565
 - name: Create the virtualenv (if it does not exist)
   command: >-
-    virtualenv
-    --no-download
-    --python={{ venv_python_executable }}
-    {{ (ansible_facts['pkg_mgr'] == 'apt') | ternary('--always-copy', '') }}
+    {{ venv_python_executable }} 
+    -m venv
     {{ venv_install_destination_path }}
   args:
     creates: "{{ venv_install_destination_path }}/bin/activate"

tasks/python_venv_wheel_build.yml

@@ -57,15 +57,10 @@
         owner: "{{ venv_build_host_user_name | default(omit) }}"
         group: "{{ venv_build_host_group_name | default(omit) }}"
 
-    # NOTE(odyssey4me):
-    # Not using --always-copy for CentOS due to
-    # https://github.com/pypa/virtualenv/issues/565
     - name: Create the wheel build virtualenv (if it does not exist)
       command: >-
-        virtualenv
-        --no-download
-        --python={{ venv_python_executable }}
-        {{ (ansible_facts['pkg_mgr'] == 'apt') | ternary('--always-copy', '') }}
+        {{ venv_python_executable }}
+        -m venv
         {{ venv_build_host_venv_path }}
       args:
         creates: "{{ venv_build_host_venv_path }}/bin/activate"

vars/main.yml

@@ -19,6 +19,7 @@ _venv_build_base_distro_package_list:
     - g++
     - "{{ (venv_python_executable == 'python2') | ternary('pkg-config', 'python3-pkgconfig') }}"
     - "{{ (venv_python_executable == 'python2') | ternary('python-dev', 'python3-dev') }}"
+    - python3-venv
   redhat:
     - autoconf
     - cmake