Added support for Linux Mint

puppet/production/site/custom_facts/lib/facter/os_release.rb

@@ -0,0 +1,19 @@
+Facter.add(:os_release) do
+  confine kernel: 'Linux'
+
+  setcode do
+    file_path = '/etc/os-release'
+    if File.exist?(file_path)
+      os_release_hash = {}
+      File.open(file_path, 'r') do |file|
+        file.each_line do |line|
+          line_data = line.split('=')
+          key = line_data[0].downcase
+          value = line_data[1].strip.gsub(/(^\")|(\"$)/, '')
+          os_release_hash[key] = value
+        end
+      end
+      os_release_hash
+    end
+  end
+end