Prepare defaults and vars

Especially to be conform to RFC 2142 there are some predefinitions
needed
Also we need to make sure that those always are applied except they are
explicitly overwritten

https://tools.ietf.org/html/rfc2142

vars/main.yml

@@ -1,2 +1,9 @@
 ---
 # vars file for dotqmail
+
+# combine dotqmail_default_files from role's default with configuration
+# Will make sure that every dotqmail file from default config will be present
+# the content hence can be adjusted by defining the extention in e.g. inventory
+# which will be prefered
+# This is done to be conform with rfc2142
+dotqmail_files: "{{dotqmail_default_files|combine(dotqmail_config_files)}}"