Skip LogAnalyzer if testcase is skipped (#2191)

Currently, LogAnalyzer still analyze log file even test case is skipped,
which may result in a confusing test result. This commit fix this issue

Author: bingwang-ms

tests/common/plugins/loganalyzer/__init__.py

@@ -27,5 +27,7 @@ def loganalyzer(duthost, request):
     loganalyzer.load_common_config()
 
     yield loganalyzer
-
+    # Skip LogAnalyzer if case is skipped
+    if request.node.rep_call.skipped:
+        return
     loganalyzer.analyze(marker)