Remove last mongo refs

Drop installation of pymongo because it is not used by Telemetry
since at least Queens [1] [2] and MongoDB is not deployed by
Kolla Ansible since Victoria.

[1] https://review.opendev.org/c/openstack/ceilometer/+/512700
[2] https://review.opendev.org/c/openstack/aodh/+/373043

Change-Id: Id44ab0fe673f01490cd8ca9c51f465ae7ad95e08

docker/aodh/aodh-base/Dockerfile.j2

@@ -45,7 +45,6 @@ ADD aodh-base-archive /aodh-base-source
 
 {% set aodh_base_pip_packages = [
     '/aodh',
-    'pymongo'
 ] %}
 
 RUN ln -s aodh-base-source/* aodh \

docker/ceilometer/ceilometer-base/Dockerfile.j2

@@ -21,7 +21,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         {% set ceilometer_base_packages = [
             'ceilometer-common',
             'python3-gnocchiclient',
-            'python3-pymongo'
          ] %}
     {% endif %}
 
@@ -30,7 +29,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% elif install_type == 'source' %}
 
 {% set ceilometer_base_pip_packages = [
-    '/ceilometer[gnocchi,mongo,mysql]'
+    '/ceilometer'
 ] %}
 
 {% set ceilometer_base_plugins_pip_packages = [

docker/kolla-toolbox/Dockerfile.j2

@@ -86,7 +86,6 @@ ENV PATH {{ virtualenv_path }}/bin:$PATH
         'mysqlclient',
         'os-client-config',
         'pbr',
-        'pymongo',
         'python-openstackclient',
         'pytz',
         'pyudev',

docker/openstack-base/Dockerfile.j2

@@ -276,7 +276,6 @@ ENV DEBIAN_FRONTEND noninteractive
         'psutil',
         'pycadf',
         'pyinotify',
-        'pymongo',
         'pymysql',
         'pyngus',
         'pyparsing',

releasenotes/notes/drop-last-mongo-refs-c12edb066544e190.yaml

@@ -0,0 +1,4 @@
+---
+other:
+  - |
+    Removes ``pymongo`` installation from images.