Added libpci and pciutils to the pmon docker (sonic-net#12684)

This enables the pcied daemon to call the corresponding system commands needed for pci transactions

dockers/docker-platform-monitor/Dockerfile.j2

@@ -26,7 +26,8 @@ RUN apt-get update &&   \
         i2c-tools       \
         psmisc          \
         python3-jsonschema \
-        libpci3
+        libpci3         \
+        pciutils
 
 # TODO: Remove these lines once we no longer need Python 2
 RUN apt-get install -f -y python-dev python-pip
@@ -48,6 +49,9 @@ RUN pip2 install enum34
 RUN pip2 install thrift==0.13.0
 RUN pip3 install thrift==0.13.0
 
+# We install the libpci module in order to be able to do PCI transactions
+RUN pip3 install libpci
+
 {% if docker_platform_monitor_debs.strip() -%}
 # Copy locally-built Debian package dependencies
 {{ copy_files("debs/", docker_platform_monitor_debs.split(' '), "/debs/") }}