fix the formatting of package lists

Continuing what was done in #254

Author: Rob McBroom

postgres/client/init.sls

@@ -15,7 +15,7 @@ include:
 # Install PostgreSQL client and libraries
 postgresql-client-libs:
   pkg.installed:
-    - pkgs: {{ pkgs }}
+    - pkgs: {{ pkgs | json }}
   {%- if postgres.use_upstream_repo == true %}
     - refresh: True
     - require:

postgres/dev/init.sls

@@ -6,7 +6,7 @@
   {% if pkgs %}
 install-postgres-dev-packages:
   pkg.installed:
-    - pkgs: {{ pkgs }}
+    - pkgs: {{ pkgs | json }}
     {% if postgres.fromrepo %}
     - fromrepo: {{ postgres.fromrepo }}
     {% endif %}