Replace logging-related restart with dynamic handler

refactor existing handlers to be the related
  "real" handler classes, which are swapped
  out dynamically by external logger "proxy" handler class

real handler swapout only done on setting change

remove restart_local_services method
get rid of uWSGI fifo file

change TCP/UDP return type contract so that it mirrors
  the request futures object
add details to socket error messages

awx/main/tasks.py

@@ -29,7 +29,7 @@ except Exception:
 
 # Celery
 from celery import Task, shared_task, Celery
-from celery.signals import celeryd_init, worker_process_init, worker_shutdown, worker_ready, celeryd_after_setup
+from celery.signals import celeryd_init, worker_shutdown, worker_ready, celeryd_after_setup
 
 # Django
 from django.conf import settings
@@ -59,10 +59,9 @@ from awx.main.utils import (get_ansible_version, get_ssh_version, decrypt_field,
                             wrap_args_with_proot, OutputEventFilter, OutputVerboseFilter, ignore_inventory_computed_fields,
                             ignore_inventory_group_removal, get_type_for_model, extract_ansible_vars)
 from awx.main.utils.safe_yaml import safe_dump, sanitize_jinja
-from awx.main.utils.reload import restart_local_services, stop_local_services
+from awx.main.utils.reload import stop_local_services
 from awx.main.utils.pglock import advisory_lock
 from awx.main.utils.ha import update_celery_worker_routes, register_celery_worker_queues
-from awx.main.utils.handlers import configure_external_logger
 from awx.main.consumers import emit_channel_notification
 from awx.conf import settings_registry
 
@@ -117,15 +116,6 @@ def celery_startup(conf=None, **kwargs):
             logger.exception(six.text_type("Failed to rebuild schedule {}.").format(sch))
 
 
-@worker_process_init.connect
-def task_set_logger_pre_run(*args, **kwargs):
-    try:
-        cache.close()
-        configure_external_logger(settings, is_startup=False)
-    except Exception:
-        logger.exception('Encountered error on initial log configuration.')
-
-
 @worker_shutdown.connect
 def inform_cluster_of_shutdown(*args, **kwargs):
     try:
@@ -200,10 +190,6 @@ def handle_setting_changes(self, setting_keys):
     cache_keys = set(setting_keys)
     logger.debug('cache delete_many(%r)', cache_keys)
     cache.delete_many(cache_keys)
-    for key in cache_keys:
-        if key.startswith('LOG_AGGREGATOR_'):
-            restart_local_services(['uwsgi', 'celery', 'beat', 'callback'])
-            break
 
 
 @shared_task(bind=True, exchange='tower_broadcast_all')