Add pg_hba.conf, Ubuntu mapping, and example..

postgres/pg_hba.conf

@@ -0,0 +1,20 @@
+# TYPE  DATABASE        USER            ADDRESS                 METHOD
+
+local  {{ pillar['postgres']['db']['name'] }}        {{ pillar['postgres']['db']['user'] }}                               md5
+
+# DO NOT DISABLE!
+# If you change this first entry you will need to make sure that the
+# database superuser can access the database using some other method.
+# Noninteractive access to all databases is required during automatic
+# maintenance (custom daily cronjobs, replication, and similar tasks).
+#
+# Database administrative login by Unix domain socket
+local   all             postgres                                peer
+
+
+# "local" is for Unix domain socket connections only
+local   all             all                                     trust
+# IPv4 local connections:
+host    all             all             127.0.0.1/32            trust
+# IPv6 local connections:
+host    all             all             ::1/128                 trust