Update debug messages and comments

The comment was taken literally from lib/plugins/strategy/linear.py and
makes no sense in free.py where we have no noop tasks.

Also update the debug messages.

lib/ansible/plugins/strategy/free.py

@@ -147,8 +147,7 @@ class StrategyModule(StrategyBase):
             if len(included_files) > 0:
                 all_blocks = dict((host, []) for host in hosts_left)
                 for included_file in included_files:
-                    # included hosts get the task list while those excluded get an equal-length
-                    # list of noop tasks, to make sure that they continue running in lock-step
+                    display.debug("collecting new blocks for %s" % included_file)
                     try:
                         new_blocks = self._load_included_file(included_file, iterator=iterator)
                     except AnsibleError as e:
@@ -157,17 +156,18 @@ class StrategyModule(StrategyBase):
                         display.warning(str(e))
                         continue
 
-                    display.debug("generating all_blocks data")
-                    display.debug("done generating all_blocks data")
                     for new_block in new_blocks:
                         task_vars = self._variable_manager.get_vars(loader=self._loader, play=iterator._play, task=included_file._task)
                         final_block = new_block.filter_tagged_tasks(play_context, task_vars)
                         for host in hosts_left:
                             if host in included_file._hosts:
                                 all_blocks[host].append(final_block)
+                    display.debug("done collecting new blocks for %s" % included_file)
 
+                display.debug("adding all collected blocks from %d included file(s) to iterator" % len(included_files))
                 for host in hosts_left:
                     iterator.add_tasks(host, all_blocks[host])
+                display.debug("done adding collected blocks to iterator")
 
             # pause briefly so we don't spin lock
             time.sleep(0.05)