add pillar.example

pillar.example

+pgbouncer:
+  users:
+    admin: somepassword
+    pgbouncer: anotherpassword
+  config:
+    present:
+      pgbouncer:
+        auth_user: pgbouncer
+        auth_query: SELECT * FROM pgbouncer.user_lookup($1)
+        admin_users: admin
+        log_connections: 0
+        log_disconnections: 0
+        log_pooler_errors: 1
+        verbose: 0
+        server_lifetime: 1800
+        ignore_startup_parameters: extra_float_digits
+      databases:
+        '*': host=pg11.lan
+    absent:
+      pgbouncer:
+        somekey: somevalue