Split arguments added for ENC

The arguments for puppet invocations are not longer explicitely split on
white-spaces.  This means that only one argument is added for ENC, while
this should be two (--node_terminus and --external_nodes).  Just
properly split the arguments.

Author: credbbl

lib/octocatalog-diff/catalog-util/command.rb

@@ -68,7 +68,8 @@ def setup
         # enc?
         if @options[:enc]
           raise Errno::ENOENT, "Did not find ENC as expected at #{@options[:enc]}" unless File.file?(@options[:enc])
-          cmdline << "--node_terminus=exec --external_nodes=#{Shellwords.escape(@options[:enc])}"
+          cmdline << "--node_terminus=exec"
+          cmdline << "--external_nodes=#{Shellwords.escape(@options[:enc])}"
         end
 
         # Future parser?