(MODULES-8695) Remove Ruby 2.0 keyword arg syntax

This code needs to be compatible with Ruby 1.9 syntax in order to
support PE 2016.4.x, and possibly even PE 2018.1.x due to jruby 1.7
(Ruby 1.9 compatible) being used in puppetserver in those versions.

lib/puppet_x/puppetlabs/scheduled_task/task.rb

@@ -390,15 +390,15 @@ def self.task(task_path)
   end
 
   # Find the first TASK_ACTION_EXEC action
-  def default_action(create_if_missing: false)
+  def default_action(options = {})
     action = nil
     (1..@definition.Actions.count).each do |i|
       index_action = action_at(i)
       action = index_action if index_action.Type == TASK_ACTION_TYPE::TASK_ACTION_EXEC
       break if action
     end
 
-    if action.nil? && create_if_missing
+    if action.nil? && options.fetch(:create_if_missing, false)
       action = @definition.Actions.Create(TASK_ACTION_TYPE::TASK_ACTION_EXEC)
     end