Fix LogAnalyzer to force load regular expressions from common files (sonic-net#5193)

What is the motivation for this PR?
Looks like commit sonic-net#3235 caused issue that LA has empty list of match errors expressions.

How did you do it?
Fix LogAnalyzer to force load regular expressions from common files

How did you verify/test it?
Executed tests which using LA, checked that LA failed in case when we have errors in logs

Signed-off-by: Petro Pikh <[email protected]>

Author: ppikh

tests/common/plugins/loganalyzer/__init__.py

@@ -30,9 +30,6 @@ def analyzer_add_marker(analyzers, node=None, results=None):
     loganalyzer = analyzers[node.hostname]
     logging.info("Add start marker into DUT syslog for host {}".format(node.hostname))
     marker = loganalyzer.init()
-    logging.info("Load config and analyze log for host {}".format(node.hostname))
-    # Read existed common regular expressions located with legacy loganalyzer module
-    loganalyzer.load_common_config()
     results[node.hostname] = marker
 
 
@@ -53,7 +50,9 @@ def loganalyzer(duthosts, request):
     analyzers = {}
     parallel_run(analyzer_logrotate, [], {}, duthosts, timeout=120)
     for duthost in duthosts:
-        analyzers[duthost.hostname] = LogAnalyzer(ansible_host=duthost, marker_prefix=request.node.name)
+        analyzer = LogAnalyzer(ansible_host=duthost, marker_prefix=request.node.name)
+        analyzer.load_common_config()
+        analyzers[duthost.hostname] = analyzer
     markers = parallel_run(analyzer_add_marker, [analyzers], {}, duthosts, timeout=120)
 
     yield analyzers