test(postgres): install postgres for tests

kitchen.yml

             - diaspora._mapdata
             - diaspora
             - redis
+            - postgres
       pillars:
         top.sls:
           base:
       dependencies:
         - name: redis
           path: test/salt/states
+        - name: postgres
+          path: test/salt/states
     verifier:
       inspec_tests:
         - path: test/integration/_mapdata

test/salt/states/postgres/init.sls

+{% set pkg = salt['grains.filter_by']({
+    'Debian': 'postgresql',
+    'RedHat': 'postgresql-server',
+}) -%}
+
+pgsql_package:
+  pkg.installed:
+    - name: {{ pkg }}
+
+{%- if grains.os_family == 'RedHat' %}
+pgsql_initdb:
+  cmd.run:
+    - name: postgresql-setup initdb
+    - require:
+      - pkg: pgsql_package
+pgsql_pg_hba_redhat:
+  file.replace:
+    - name: /var/lib/pgsql/data/pg_hba.conf
+    - pattern: ' ident'
+    - repl: ' md5'
+    - require:
+      - cmd: pgsql_initdb_redhat
+    - require_in:
+      - service: pgsql_service
+{%- endif %}
+
+pgsql_service:
+  service.running:
+    - name: postgresql
+    - require:
+      - pkg: pgsql_package
+
+pgsql_user:
+  postgres_user.present:
+    - name: {{ salt['pillar.get']('diaspora:database:username') }}
+    - password: {{ salt['pillar.get']('diaspora:database:password') }}
+    - createdb: True
+    - require:
+      - service: pgsql_service
+    - require_in:
+      - cmd: diaspora_create_database