Add function to report current logging level

Add get_log_level() function to return the highest LOG_LEVEL_* used
for any logging mechanism.

src/common/log.c

@@ -1407,3 +1407,15 @@ dump_cleanup_list(void)
 	}
 	slurm_mutex_unlock(&fatal_lock);
 }
+
+/* Return the highest LOG_LEVEL_* used for any logging mechanism.
+ * For example, if LOG_LEVEL_INFO is returned, we know that all verbose and
+ * debug type messages will be ignored. */
+extern int get_log_level(void)
+{
+	int level;
+
+	level = MAX(log->opt.syslog_level, log->opt.logfile_level);
+	level = MAX(level, log->opt.stderr_level);
+	return level;
+}

src/common/log.h

@@ -240,6 +240,11 @@ void log_flush(void);
  */
 extern void log_set_debug_flags(void);
 
+/* Return the highest LOG_LEVEL_* used for any logging mechanism.
+ * For example, if LOG_LEVEL_INFO is returned, we know that all verbose and
+ * debug type messages will be ignored. */
+extern int get_log_level(void);
+
 /*
  * the following log a message to the log facility at the appropriate level:
  *