Add a package for freezer

freezer need the trickle package  to limit the traffic speed

refer to
ebc4e8a57c/freezer/common/config.py (L692)

Change-Id: I5d1c26a40ed15a1a41db057b4d68ebc51b967b97

docker/freezer/freezer-base/Dockerfile.j2

@@ -13,6 +13,10 @@ RUN echo '{{ install_type }} not yet available for {{ base_distro }}' \
     && /bin/false
 
 {% elif install_type == 'source' %}
+    {% set freezer_base_packages = [
+        'trickle'
+    ] %}
+{{ macros.install_packages(freezer_base_packages | customizable("packages")) }}
 
 ADD freezer-base-archive /freezer-base-source