Revert "Message about using --parallel, and how other CWL runners are available. (#1671)" (#1682)

This reverts commit 88b9cfe.

Author: mr-c

cwltool/executors.py

@@ -191,15 +191,6 @@ def check_for_abstract_op(tool: CWLObjectType) -> None:
             return (self.final_output[0], self.final_status[0])
         return (None, "permanentFail")
 
-    def message_about_other_runners(self) -> None:
-        _logger.info(
-            "Need to grow beyond `cwltool` and scale up your workflows to run on a multi-node cluster, or in the cloud?"
-        )
-        _logger.info(
-            "CWL workflows are portable and run on many commercial and open source platforms."
-        )
-        _logger.info("Visit https://www.commonwl.org/implementations/ to learn more.")
-
 
 class SingleJobExecutor(JobExecutor):
     """Default single-threaded CWL reference executor."""
@@ -212,10 +203,6 @@ def run_jobs(
         runtime_context: RuntimeContext,
     ) -> None:
 
-        _logger.info(
-            "Using default serial job executor.  Use `cwltool --parallel` to run multiple steps at a time."
-        )
-
         process_run_id = None  # type: Optional[str]
 
         # define provenance profile for single commandline tool
@@ -265,7 +252,6 @@ def run_jobs(
                 else:
                     logger.error("Workflow cannot make any more progress.")
                     break
-            self.message_about_other_runners()
         except (
             ValidationException,
             WorkflowException,
@@ -430,10 +416,6 @@ def run_jobs(
         runtime_context: RuntimeContext,
     ) -> None:
 
-        _logger.info(
-            "Using parallel job executor.  Multiple steps will run at once as hardware resources permit."
-        )
-
         self.taskqueue = TaskQueue(
             threading.Lock(), psutil.cpu_count()
         )  # type: TaskQueue
@@ -474,7 +456,6 @@ def run_jobs(
         finally:
             self.taskqueue.drain()
             self.taskqueue.join()
-        self.message_about_other_runners()
 
 
 class NoopJobExecutor(JobExecutor):