test(ubuntu-1804): fix ipv6 bind problem on ubuntu 18.04 in docker

kitchen.yml

           '*':
             - diaspora._mapdata
             - diaspora
+            - redis
       pillars:
         top.sls:
           base:
       pillars_from_files:
         diaspora.sls: pillar.example
         tests.sls: test/salt/pillar/tests.sls
+      dependencies:
+        - name: redis
+          path: test/salt/states
     verifier:
       inspec_tests:
         - path: test/integration/_mapdata

test/salt/states/redis/init.sls

+{%- if grains.osfinger == 'Ubuntu-18.04' %}
+redis_config:
+  file.replace:
+    - name: '/etc/redis/redis.conf'
+    - pattern: '^bind .*$'
+    - repl: 'bind 127.0.0.1'
+    - require:
+      - pkg: redis_package
+    - require_in:
+      - service: redis_service
+{%- endif %}