Revert "Adding TRACE level to VOLTHA logs"

This reverts commit 3d7abcced71b0f67d11ca028907803494a0b0a1e.

Change-Id: I9efb08383389c5150cc070de902e6bb1c9736e30
diff --git a/common/structlog_setup.py b/common/structlog_setup.py
index 828c439..cbbda89 100644
--- a/common/structlog_setup.py
+++ b/common/structlog_setup.py
@@ -79,14 +79,6 @@
     logging.config.dictConfig(log_config)
     logging.root.level -= 10 * verbosity_adjust
 
-    # Add TRACE log level (lower than DEBUG:10)
-    TRACE_LOGLVL = 5
-    logging.addLevelName(TRACE_LOGLVL, "TRACE")
-    def trace_loglevel(self, message, *args, **kws):
-        if self.isEnabledFor(TRACE_LOGLVL):
-            self._log(TRACE_LOGLVL, message, args, **kws)
-    logging.Logger.trace = trace_loglevel
-
     processors = [
         add_exc_info_flag_for_exception,
         structlog.processors.StackInfoRenderer(),
@@ -104,6 +96,7 @@
     log.info("first-line")
     return log
 
+
 def update_logging(instance_id, vcore_id):
     """
     Add the vcore id to the structured logger