[caclmgrd] Add support for multi-ASIC platforms (sonic-net#5022)

* Support for Control Plane ACL's for Multi-asic Platforms.
Following changes were done:
 1) Moved from using blocking listen() on Config DB to the select() model
 via python-swsscommon since we have to wait on event from multiple
 config db's
 2) Since  python-swsscommon is not available on host added libswsscommon and python-swsscommon
    and dependent packages in the base image (host enviroment)
 3) Made iptables programmed in all namespace using ip netns exec

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

* Address Review Comments

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

* Fix Review Comments

* Fix Comments

* Added Change for Multi-asic to have iptables
rules to accept internal docker tcp/udp traffic
needed for syslog and redis-tcp connection.

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

* Fix Review Comments

* Added more comments on logic.

* Fixed all warning/errors reported by http://pep8online.com/
other than line > 80 characters.

* Fix Comment
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

* Verified with swsscommon package. Fix issue for single asic platforms.

* Moved to new python package

* Address Review Comments.

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

* Address Review Comments.

files/build_templates/sonic_debian_extension.j2

@@ -221,6 +221,13 @@ sudo DEBIAN_FRONTEND=noninteractive dpkg --root=$FILESYSTEM_ROOT -i $debs_path/k
  sudo LANG=C DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true chroot $FILESYSTEM_ROOT apt-get -q --no-install-suggests --no-install-recommends --force-no install
 fi
 
+# Install python-swss-common package and all its dependent packages
+{% if python_swss_debs.strip() -%}
+{% for deb in python_swss_debs.strip().split(' ') -%}
+sudo dpkg --root=$FILESYSTEM_ROOT -i {{deb}} || sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install -f
+{% endfor %}
+{% endif %}
+
 # Install custom-built monit package and SONiC configuration files
 sudo dpkg --root=$FILESYSTEM_ROOT -i $debs_path/monit_*.deb || \
  sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install -f