added client formula and required default values

postgres/client.sls

@@ -0,0 +1,24 @@
+{% from "postgres/map.jinja" import postgres with context %}
+
+{% if salt['pillar.get']('postgres:use_upstream_repo') %}
+install-postgresql-repo:
+  pkgrepo.managed:
+    - humanname: PostgreSQL Official Repository
+    - name: {{ postgres.pkg_repo }}
+    - keyid: B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8
+    - keyserver: keyserver.ubuntu.com
+    - file: {{ postgres.pkg_repo_file }}
+    - require_in:
+        - install-postgresql-client
+{% endif %}
+
+install-postgresql-client:
+  pkg.installed:
+    - name: {{ postgres.pkg_client }}
+    - refresh: {{ salt['pillar.get']('postgres:use_upstream_repo', False) }}
+
+{% if postgres.pkg_libpq_dev != False %}
+install-postgres-libpq-dev:
+  pkg.installed:
+    - name: {{ postgres.pkg_libpq_dev }}
+{% endif %}