[docker-mgmt-framework]: update mgmt framework docker to support sonic-cli cmd (#6148)

- Why I did it

migrate to python3 support
add dependent packages for Klish
allow login as non-root user
- How I did it
update sonic-cli script to start Klish with user name, system name and timeout
update the Dockerfile.j2 to resolve dependent packages
add python3-dev for Klish use

- How to verify it
Incremental buster build with Azure/sonic-mgmt-framework#76 and verify the sonic-cli

- Description for the changelog
Migrate to python3.7 support, update sonic-cli script and resolve package dependencies

dockers/docker-sonic-mgmt-framework/Dockerfile.j2

@@ -7,21 +7,7 @@ RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#%s
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && \
-    apt-get install -y g++ python3-dev libxml2
-
-# TODO: Remove these lines once we no longer need Python 2
-RUN apt-get install -f -y python-dev python-pip
-RUN pip2 install --upgrade 'pip<21'
-RUN apt-get purge -y python-pip
-RUN pip2 install setuptools==40.8.0
-RUN pip2 install wheel==0.35.1
-RUN pip2 install connexion==1.1.15 \
-                setuptools==21.0.0 \
-                grpcio-tools==1.20.0 \
-                certifi==2017.4.17 \
-                python-dateutil==2.6.0 \
-                six==1.11.0 \
-                urllib3==1.21.1
+    apt-get install -y g++ python3-dev libxml2 libcurl3-gnutls libcjson-dev
 
 RUN pip3 install connexion==2.7.0 \
                  setuptools==21.0.0 \
@@ -46,11 +32,12 @@ COPY ["start.sh", "rest-server.sh", "/usr/bin/"]
 COPY ["mgmt_vars.j2", "/usr/share/sonic/templates/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 
-# TODO: Remove this line once we no longer need Python 2
-RUN apt-get purge -y python-dev
-
 RUN apt-get remove -y g++ python3-dev
 RUN apt-get clean -y; apt-get autoclean -y; apt-get autoremove -y
 RUN rm -rf /debs
 
+## TODO: symbolic links will be removed when AAA improvements get merged
+RUN ln -sf /host_etc/passwd /etc/passwd	
+RUN ln -sf /host_etc/group /etc/group
+
 ENTRYPOINT ["/usr/local/bin/supervisord"]

dockers/docker-sonic-mgmt-framework/base_image_files/sonic-cli

@@ -1,4 +1,21 @@
 #!/bin/bash
 
-docker exec -it mgmt-framework /usr/sbin/cli/clish_start "$@"
-
+# Disallow CLI for the root user, since we don't have auth certs for root
+if [[ "$(id -u)" == 0 ]]
+then
+    echo "FATAL: root cannot launch CLI" >&2
+    exit 1
+fi
+TIMEOUT=605
+if [[ "$1" =~ "prompt=" ]]
+then
+   SYSTEM_NAME=`echo $1 | cut -d"=" -f2`
+   shift
+   docker exec -e SYSTEM_NAME=$SYSTEM_NAME -e CLI_USER="$USER" -u $(id -u):$(id -g) -it mgmt-framework /usr/sbin/cli/clish_start -t "$TIMEOUT" "$@"
+else
+   docker exec -e CLI_USER="$USER" -e SYSTEM_NAME=$HOSTNAME -u $(id -u):$(id -g) -it mgmt-framework /usr/sbin/cli/clish_start -t "$TIMEOUT" "$@"
+fi
+ret=$?
+if [ $ret -ne 0 ]; then
+   [[ -e /tmp/fast-reboot-progress || -e /tmp/reboot-progress ]] && sleep infinity
+fi

sonic-slave-buster/Dockerfile.j2

@@ -302,6 +302,8 @@ RUN apt-get update && apt-get install -y \
         xsltproc \
         python-lxml \
         libexpat1-dev \
+        libcurl3-gnutls \
+        libcjson-dev \
 # For WPA supplication
         qtbase5-dev          \
         aspell-en            \