refactor(pillars): dry default pillars

syslog_ng/defaults.yaml

 # -*- coding: utf-8 -*-
 # vim: ft=yaml
 ---
-syslog_ng: {}
+syslog_ng:
+  package: syslog-ng
+  service: syslog-ng
+  syslog_ng_config: /etc/syslog-ng/syslog-ng.conf
+  syslog_ng_config_src: salt://syslog_ng/files/syslog-ng.conf

syslog_ng/osfamilymap.yaml

 # -*- coding: utf-8 -*-
 # vim: ft=yaml
 ---
-Debian:
-  package: syslog-ng
-  service: syslog-ng
-  syslog_ng_config: /etc/syslog-ng/syslog-ng.conf
-  syslog_ng_config_src: salt://syslog_ng/files/syslog-ng.conf
-
 Gentoo:
   package: app-admin/syslog-ng
-  service: syslog-ng
-  syslog_ng_config: /etc/syslog-ng/syslog-ng.conf
-  syslog_ng_config_src: salt://syslog_ng/files/syslog-ng.conf
-
-RedHat:
-  package: syslog-ng
-  service: syslog-ng
-  syslog_ng_config: /etc/syslog-ng/syslog-ng.conf
-  syslog_ng_config_src: salt://syslog_ng/files/syslog-ng.conf