task logging revamp

* allow global no_log setting, no need to set at play or task level, but can be overriden by them
 * allow turning off syslog only on task execution from target host (manage_syslog), overlaps with no_log functionality
 * created log function for task modules to use, now we can remove all syslog references, will use systemd journal if present
 * added debug flag to modules, so they can make it call new log function conditionally
 * added debug logging in module's run_command

examples/ansible.cfg

@@ -177,6 +177,13 @@ fact_caching = memory
 #retry_files_enabled = False
 #retry_files_save_path = ~/.ansible-retry
 
+
+# prevents logging of task data, off by default
+#no_log = False
+
+# prevents logging of tasks, but only on the targets, data is still logged on the master/controller
+#managed_syslog = True
+
 [privilege_escalation]
 #become=True
 #become_method=sudo