No longer install some unnecessary Python 2 packages in host (#6301)

- No longer install Python 2 packages in host:
    - libpython2.7-dev
    - docker
    - ipaddress
    - netifaces
    - azure-storage
    - watchdog
    - futures

- Install Python 3 versions of the following packages in host:
    - docker
    - azure-storage
    - watchdog
    - redis
    - swsssdk (install unconditionally)

build_debian.sh

@@ -428,14 +428,12 @@ sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install 'setup
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install 'wheel==0.35.1'
 
 # docker Python API package is needed by Ansible docker module as well as some SONiC applications
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install 'docker==4.1.0'
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install 'docker==4.3.1'
 
 ## Note: keep pip installed for maintainance purpose
 
-## Get gcc and python dev pkgs
-sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install gcc libpython2.7-dev
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install 'netifaces==0.10.7'
+# Install GCC, needed for building/installing some Python packages
+sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install gcc
 
 ## Create /var/run/redis folder for docker-database to mount
 sudo mkdir -p $FILESYSTEM_ROOT/var/run/redis
@@ -527,9 +525,6 @@ then
 
 fi
 
-## Remove gcc and python dev pkgs
-sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y remove gcc libpython2.7-dev
-
 ## Add mtd and uboot firmware tools package
 sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install u-boot-tools mtd-utils device-tree-compiler
 
@@ -549,6 +544,9 @@ if [[ $CONFIGURED_ARCH == armhf || $CONFIGURED_ARCH == arm64 ]]; then
     fi
 fi
 
+# Remove GCC
+sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y remove gcc
+
 ## Clean up apt
 sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y autoremove
 sudo LANG=C chroot $FILESYSTEM_ROOT apt-get autoclean

files/build_templates/sonic_debian_extension.j2

@@ -103,6 +103,7 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
 
 # Install Python client for Redis
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install "redis==3.5.3"
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install "redis==3.5.3"
 
 # Install redis-dump-load Python 3 package
 # Note: the scripts will be overwritten by corresponding Python 2 package
@@ -117,20 +118,15 @@ sudo cp {{redis_dump_load_py2_wheel_path}} $FILESYSTEM_ROOT/$REDIS_DUMP_LOAD_PY2
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install $REDIS_DUMP_LOAD_PY2_WHEEL_NAME
 sudo rm -rf $FILESYSTEM_ROOT/$REDIS_DUMP_LOAD_PY2_WHEEL_NAME
 
-# Install Python module for ipaddress
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install ipaddress
-
 # Install Python module for psutil
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install psutil
 
 # Install SwSS SDK Python 3 package
 # Note: the scripts will be overwritten by corresponding Python 2 package
-if [ -e {{swsssdk_py3_wheel_path}} ]; then
-    SWSSSDK_PY3_WHEEL_NAME=$(basename {{swsssdk_py3_wheel_path}})
-    sudo cp {{swsssdk_py3_wheel_path}} $FILESYSTEM_ROOT/$SWSSSDK_PY3_WHEEL_NAME
-    sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install $SWSSSDK_PY3_WHEEL_NAME
-    sudo rm -rf $FILESYSTEM_ROOT/$SWSSSDK_PY3_WHEEL_NAME
-fi
+SWSSSDK_PY3_WHEEL_NAME=$(basename {{swsssdk_py3_wheel_path}})
+sudo cp {{swsssdk_py3_wheel_path}} $FILESYSTEM_ROOT/$SWSSSDK_PY3_WHEEL_NAME
+sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install $SWSSSDK_PY3_WHEEL_NAME
+sudo rm -rf $FILESYSTEM_ROOT/$SWSSSDK_PY3_WHEEL_NAME
 
 # Install SwSS SDK Python 2 package
 SWSSSDK_PY2_WHEEL_NAME=$(basename {{swsssdk_py2_wheel_path}})
@@ -383,11 +379,8 @@ sudo cp $IMAGE_CONFIGS/corefile_uploader/core_analyzer.rc.json $FILESYSTEM_ROOT_
 sudo chmod og-rw $FILESYSTEM_ROOT_ETC_SONIC/core_analyzer.rc.json
 
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install libffi-dev libssl-dev
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install azure-storage==0.36.0
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install azure-storage==0.36.0
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install watchdog==0.10.2
 sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip3 install watchdog==0.10.3
-sudo https_proxy=$https_proxy LANG=C chroot $FILESYSTEM_ROOT pip2 install futures==3.3.0
 
 {% if include_kubernetes == "y" %}
 # Install remote Container mgmt package