fix(events): wrong mapping of normal events

all normal event were written into the warning log file
at least the counting was correct

sdcm/sct_events.py

@@ -688,7 +688,7 @@ def __init__(self, log_dir):
             Severity.CRITICAL: self.critical_events_filename,
             Severity.ERROR: self.error_events_filename,
             Severity.WARNING: self.warning_events_filename,
-            Severity.NORMAL: self.warning_events_filename,
+            Severity.NORMAL: self.normal_events_filename,
         }
         self.level_summary = collections.defaultdict(int)