Improve pip install process for offline deployment.

* "Use distribution-provided pip"
    * "Use python's pip module invocation method"
    * "Install pip earlier in order to avoid multiple installation"
    * "Remove pip_version variable requirement and call"

Change-Id: Id0e738044a1931f9d611a7281a48ea4a593f1cf1
Closes-bug: #1893204

docker/base/Dockerfile.j2

@@ -258,6 +258,7 @@ RUN {{ macros.install_packages(base_centos_yum_repo_packages | customizable("cen
         'ncurses',
         'procps-ng',
         'python3',
+        'python3-pip',
         'socat',
         'sudo',
         'tar',
@@ -329,6 +330,7 @@ COPY apt_preferences /etc/apt/preferences.d/kolla-custom
    'open-iscsi',
    'procps',
    'python3',
+   'python3-pip',
    'socat',
    'sudo',
    'tgt']

docker/elasticsearch/elasticsearch-curator/Dockerfile.j2

@@ -29,7 +29,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
     'elasticsearch-curator'
 ] %}
 
-RUN {{ macros.install_pip(elasticsearch_curator_pip_packages | customizable("pip_packages"), constraints=false, pip_version="pip3") }} \
+RUN {{ macros.install_pip(elasticsearch_curator_pip_packages | customizable("pip_packages"), constraints=false) }} \
     && mkdir -p /etc/elasticsearch-curator \
     && chown -R elasticsearch: /etc/elasticsearch-curator
 

docker/gnocchi/gnocchi-base/Dockerfile.j2

@@ -42,7 +42,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         ] %}
 
 {{ macros.install_packages(gnocchi_base_packages | customizable("packages")) }}
-RUN {{ macros.install_pip(gnocchi_base_pip_packages | customizable("pip_packages"), constraints=false, pip_version="pip3") }}
+RUN {{ macros.install_pip(gnocchi_base_pip_packages | customizable("pip_packages"), constraints=false) }}
 
     {% endif %}
 {% elif install_type == 'source' %}

docker/kolla-toolbox/Dockerfile.j2

@@ -53,10 +53,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% endif %}
 {{ macros.install_packages(kolla_toolbox_packages | customizable("packages")) }}
 
-{% block kolla_toolbox_source_install_python_pip %}
-{{ macros.get_pip() }}
-{% endblock %}
-
 {% set kolla_toolbox_pip_virtualenv_packages = [
         'virtualenv'
     ] %}

docker/macros.j2

@@ -32,18 +32,9 @@
 {% endif %}
 {%- endmacro %}
 
-{% macro get_pip() %}
+{% macro install_pip(packages, constraints = true) %}
-RUN curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py \
-    && python3 get-pip.py \
-    && rm get-pip.py
-{% endmacro %}
-
-{% macro install_pip(packages, constraints = true, pip_version = pip) %}
 {%- if packages is sequence and packages|length > 0 -%}
-{%- if not pip_version -%}
+    python{{ distro_python_version }} -m pip --no-cache-dir install --upgrade{{ ' ' }}
-    {%- set pip_version = 'pip' -%}
-{%- endif -%}
-    {{ pip_version }} --no-cache-dir install --upgrade{{ ' ' }}
     {%- if constraints %}-c /requirements/upper-constraints.txt {% endif -%}
     {{ packages | join(' ') }}
 {%- else -%}

docker/openstack-base/Dockerfile.j2

@@ -196,10 +196,6 @@ ENV DEBIAN_FRONTEND noninteractive
 
 {{ macros.install_packages(openstack_base_packages | customizable("packages")) }}
 
-{% block source_install_python_pip %}
-{{ macros.get_pip() }}
-{% endblock %}
-
 {% set openstack_base_pip_packages = [
         'Babel',
         'Mako',

docker/openvswitch/openvswitch-netcontrold/Dockerfile.j2

@@ -20,7 +20,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
   ]
 %}
 
-RUN {{ macros.install_pip(openvswitch_netcontrold_pip_packages | customizable("pip_packages"), constraints = false, pip_version = "pip3") }}
+RUN {{ macros.install_pip(openvswitch_netcontrold_pip_packages | customizable("pip_packages"), constraints = false) }}
 
 {% endblock %}