Include Postfix pillar via role

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

pillar/common.sls

@@ -1,6 +1,7 @@
 include:
   - role.salt.common
   - role.salt.minion
+  - role.mta.postfix
 
 managed_header_pound: |
   ### This file is managed via https://git.com.de/LibertaCasa/salt

salt/common/suse.sls

@@ -3,7 +3,7 @@ include:
   - profile.zypp
   - profile.node_exporter
   - users
-  - .postfix
+  - role.mta.postfix
 
 {#- to-do: move this to some formula or macro -#}
 {%- set osfullname = grains['osfullname'] -%}