check_puppet: Add "reason" information if puppet is disabled

[sottolski]

I think it's useful to see why puppet has been disbled right away, so I hacked a little patch. I'm not into ruby, so it's probably not the correct style, but it works:

@@ -28,6 +28,7 @@
 $LOAD_PATH.unshift File.expand_path('/opt/puppetlabs/puppet/lib/ruby/vendor_ruby/', __FILE__)
 # end fix to make it run on jessie
 
+require "json"
 require "optparse"
 require "puppet"
 require "puppet/defaults"
@@ -227,10 +228,13 @@
             puts "checking puppet is enabled"
         end
         if FileTest.exist?("#{OPTIONS[:lockfile]}")
+            lfile = File.open("#{OPTIONS[:lockfile]}", 'r')
+            ldata = JSON.load lfile
+            lreason = ldata["disabled_message"]
             # This used to be the case pre 2.6, not supporting that any more
             # if File.zero?("#{OPTIONS[:lockfile]}")
                 @enabled_status = "CRITICAL"
-                @enabled_msg = "PUPPET RUNS DISABLED"
+                @enabled_msg = "PUPPET RUNS DISABLED, reason: '#{lreason}'"
             # else
             #    @enabled_status = "OK"
             #    @enabled_msg = "puppet runs enabled (currently in progress)"