Update pillar.example to have settings for config file

pillar.example

@@ -0,0 +1,23 @@
+postfix:
+  smtpd_banner: $myhostname ESMTP $mail_name (Ubuntu)
+  biff: no
+
+  append_dot_mydomain: no
+
+  readme_directory: no
+
+  smtpd_tls_cert_file: /etc/ssl/certs/ssl-cert-snakeoil.pem
+  smtpd_tls_key_file: /etc/ssl/private/ssl-cert-snakeoil.key
+  smtpd_use_tls: yes
+  smtpd_tls_session_cache_database: btree:${data_directory}/smtpd_scache
+  smtp_tls_session_cache_database: btree:${data_directory}/smtp_scache
+
+  myhostname: localhost
+  alias_maps: hash:/etc/aliases
+  alias_database: hash:/etc/aliases
+  mydestination: localhost, localhost.localdomain, , localhost
+  relayhost: 
+  mynetworks: 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+  mailbox_size_limit: 0
+  recipient_delimiter: +
+  inet_interfaces: all