Refactor volume options fact as array

Volume options are stored as comma separated string, the only use from
the gluster module is in volume.pp, there it is converted back to an
array using split(). Some gluster volume options are using commas for
splitting values (e.g. auth.allow), this conflicts with this behaviour.

Author: svenbs

lib/facter/gluster.rb

@@ -82,7 +82,7 @@
       volume_options.each do |vol, opts|
         Facter.add("gluster_volume_#{vol}_options".to_sym) do
           setcode do
-            opts.join(',')
+            opts
           end
         end
       end

manifests/volume.pp

@@ -224,7 +224,7 @@
       # did the options change?
       $current_options = getvar("gluster_volume_${title}_options")
       if $current_options {
-        $_current = sort( split($current_options, ',') )
+        $_current = sort($current_options)
       } else {
         $_current = []
       }