docker: use python3-venv to create virtual env

Debian 'bookworm' does not like when someone installs Python packages
into system directories. So instead of installing 'virtualenv' from pip
we move to use 'python3 -m venv' which we install from distribution
repositories (on Debian/Ubuntu as EL9 has it in base 'python3').

Change-Id: I7092b561d81c362ca24f84a3d753e777e5625ab3

docker/kolla-toolbox/Dockerfile.j2

@@ -48,13 +48,13 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         'libxslt1-dev',
         'openvswitch-switch',
         'python3-dev',
+        'python3-venv',
         'rabbitmq-server',
      ] %}
 {% endif %}
 {{ macros.install_packages(kolla_toolbox_packages | customizable("packages")) }}
 
 {% set kolla_toolbox_pip_virtualenv_packages = [
-        'virtualenv'
     ] %}
 
 {% block kolla_toolbox_upper_constraints %}
@@ -62,7 +62,7 @@ RUN mkdir -p /requirements \
     && curl -o /requirements/upper-constraints.txt ${UPPER_CONSTRAINTS_FILE:-https://releases.openstack.org/constraints/upper/{{ openstack_release }}} \
     && sed -e "/^openstacksdk/d" -i /requirements/upper-constraints.txt \
     && {{ macros.install_pip(kolla_toolbox_pip_virtualenv_packages | customizable("pip_virtualenv_packages")) }} \
-    && virtualenv --system-site-packages {{ virtualenv_path }}
+    && python3 -m venv --system-site-packages {{ virtualenv_path }}
 {% endblock %}
 
 ENV PATH {{ virtualenv_path }}/bin:$PATH

docker/openstack-base/Dockerfile.j2

@@ -50,6 +50,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         'libz-dev',
         'pkg-config',
         'python3-dev',
+        'python3-venv',
         'zip'
     ] %}
 
@@ -191,8 +192,7 @@ RUN ln -s openstack-base-source/* /requirements \
 #}
     && sed -i /^ovs=/d /requirements/upper-constraints.txt \
     && mkdir -p /var/lib/kolla \
-    && {{ macros.install_pip(['virtualenv'])}} \
-    && virtualenv --system-site-packages /var/lib/kolla/venv
+    && python3 -m venv --system-site-packages /var/lib/kolla/venv
 
 ENV PATH /var/lib/kolla/venv/bin:$PATH