Install python-redis package to docker containers (#14632)

Install python-redis package to docker containers

#### Why I did it
This this bug: #14531
The 'flush_unused_database' is part of docker-database, and docker-database does not install python-redis package by itself. it's using redis installed by sonic-py-swsssdk.
So after remove sonic-py-swsssdk from container, this script break.

To this this bug and avoid similer bug happen again, install python-redis to docker containers which removed sonic-py-swsssdk .

#### How I did it
Install python-redis to containers.

#### How to verify it
Pass all UT.
Create new UT to cover this scenario: sonic-net/sonic-mgmt#8032

#### Description for the changelog
Improve sudo cat command for RO user.

dockers/docker-config-engine-bullseye/Dockerfile.j2

@@ -23,6 +23,9 @@ RUN apt-get install -y        \
 RUN pip3 install pyangbind==0.8.1
 RUN pip3 uninstall -y enum34
 
+# Install python-redis
+RUN pip3 install redis==4.5.4
+
 {% if docker_config_engine_bullseye_debs.strip() %}
 # Copy locally-built Debian package dependencies
 {{ copy_files("debs/", docker_config_engine_bullseye_debs.split(' '), "/debs/") }}

dockers/docker-config-engine-buster/Dockerfile.j2

@@ -23,6 +23,9 @@ RUN apt-get install -y        \
 RUN pip3 install pyangbind==0.8.1
 RUN pip3 uninstall -y enum34
 
+# Install python-redis
+RUN pip3 install redis==4.5.4
+
 {% if docker_config_engine_buster_debs.strip() %}
 # Copy locally-built Debian package dependencies
 {{ copy_files("debs/", docker_config_engine_buster_debs.split(' '), "/debs/") }}

dockers/docker-config-engine-stretch/Dockerfile.j2

@@ -10,6 +10,9 @@ RUN apt-get update         && \
         build-essential       \
         python-dev
 
+# Install python-redis
+RUN pip install redis>=3.5.3
+
 {%- if CONFIGURED_ARCH == "armhf" or CONFIGURED_ARCH == "arm64" %}
 RUN apt-get install -y        \
         libxslt-dev           \

dockers/docker-config-engine/Dockerfile.j2

@@ -8,6 +8,9 @@ RUN apt-get update
 # Dependencies for sonic-cfggen
 RUN apt-get install -y build-essential python-dev
 
+# Install python-redis
+RUN pip install redis>=3.5.3
+
 {% if docker_config_engine_debs.strip() %}
 COPY \
 {% for deb in docker_config_engine_debs.split(' ') -%}