Pin erlang

Now that we run without erlang pinned by the repository itself,
let's pin it on our side.

Change-Id: Ifa491b102ad0db7f6dc645ca552d83b53bcf3b46

docker/base/apt_preferences.ubuntu

@@ -1,3 +1,7 @@
 Package: rabbitmq-server
 Pin: version 3.8.*
 Pin-Priority: 1000
+
+Package: erlang*
+Pin: version 1:23.*
+Pin-Priority: 1000

docker/kolla-toolbox/Dockerfile.j2

@@ -19,6 +19,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% if base_package_type == 'rpm' %}
     {% set kolla_toolbox_packages = [
         'crudini',
+        'erlang-23.*',
         'gcc',
         'gdisk',
         'git',

docker/rabbitmq/Dockerfile.j2

@@ -15,6 +15,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% if base_package_type == 'rpm' %}
     {% set rabbitmq_packages = [
         'hostname',
+        'erlang-23.*',
         'rabbitmq-server-3.8.*'
     ] %}