Remove postfix_master confine on EOL postfix version

The binary used by the postfix_master provider was introduced only in
postfix v2.11, which is why the provider was confined to this version.

However, this causes trouble on initial run, when the package is not yet
installed. Since postfix 2.11 is already EOL anyway, the easiest fix is
to removed the confine.

Patch provided by Craig Watson (see #10).

Fixes #9.

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Remove the confine on EOL postfix version for postconf_master provider ([#9])
 
 ## Release [1.0.2] - 2018-10-28
 This release fixes postfix reloading on config changes.
@@ -80,6 +82,7 @@ First release as oxc-postfix, now requires Puppet 4.9
 [0.2.0]: https://github.com/oxc/puppet-postfix/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/oxc/puppet-postfix/compare/v0.0.1...v0.1.0
 [0.0.1]: https://github.com/oxc/puppet-postfix/compare/f7d8b52...v0.0.1
+[#9]: https://github.com/oxc/puppet-postfix/issues/9
 [#7]: https://github.com/oxc/puppet-postfix/issues/7
 [#6]: https://github.com/oxc/puppet-postfix/pull/6
 [#5]: https://github.com/oxc/puppet-postfix/issues/5

lib/puppet/provider/postconf_master/postconf.rb

@@ -1,7 +1,6 @@
 require File.expand_path(File.join(File.dirname(__FILE__), '..', 'postconf'))
 
 Puppet::Type.type(:postconf_master).provide(:postconf, parent: Puppet::Provider::Postconf) do
-  confine postfixversion: '2.11'
 
   def self.instances
     postfix_instances.map { |instance, path|