update remotehosts.py to formally name the threads it launches

- this is helpful because if Python throws an error message it will
  include the formal name of the thread which can be useful for
  tracking where the problem came from

endpoints/remotehosts/remotehosts.py

@@ -1276,7 +1276,8 @@ def image_pull_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "IPWT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting image pull thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0
@@ -1427,7 +1428,7 @@ def create_thread_pool(description, acronym, work, worker_threads_count, worker_
             thread_logger("MAIN", "Aborting %s launch because no more work to do" % (acronym))
             break
         thread_logger("MAIN", "Creating and starting %s with thread ID %d" % (acronym, thread_id))
-        worker_threads[thread_id] = threading.Thread(target = worker_thread_function, args = (thread_id, work, worker_threads_rcs))
+        worker_threads[thread_id] = threading.Thread(target = worker_thread_function, args = (thread_id, work, worker_threads_rcs), name = "%s-%d" % (acronym, thread_id))
         worker_threads[thread_id].start()
 
     thread_logger("MAIN", "Waiting for all %s work jobs to be consumed" % (acronym))
@@ -1500,7 +1501,8 @@ def remote_mkdirs_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "RWMT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting remote mkdirs thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0
@@ -1952,7 +1954,8 @@ def launch_engines_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "LEWT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting launch engines thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0
@@ -3295,7 +3298,8 @@ def shutdown_engines_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "SEWT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting shutdown engines thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0
@@ -3409,7 +3413,8 @@ def image_mgmt_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "IMWT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting image management thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0
@@ -3500,7 +3505,8 @@ def collect_sysinfo_worker_thread(thread_id, work_queue, threads_rcs):
     Returns:
         None
     """
-    thread_name = "CSWT-%d" % (thread_id)
+    thread = threading.current_thread()
+    thread_name = thread.name
     thread_logger(thread_name, "Starting collect sysinfo thread with thread ID %d and name = '%s'" % (thread_id, thread_name))
     rc = 0
     job_count = 0