[Master] SffLoggerForPortUpdateEvent class does not have log_debug function

[veronica-arista]

A recent PR #582 changed a call in sonic-xcvrd/xcvrd/xcvrd_utilities/port_event_helper.py from log_warning() to log_debug(), which does not exist for SffLoggerForPortUpdateEvent, resulting in the following error:

ERR pmon#xcvrd[317]: Exception occured at SffManagerTask thread due to AttributeError("'SffLoggerForPortUpdateEvent' object has no attribute 'log_debug'")
ERR pmon#xcvrd[317]: Traceback (most recent call last):
ERR pmon#xcvrd[317]:   File "/usr/local/lib/python3.11/dist-packages/xcvrd/sff_mgr.py", line 231, in run
ERR pmon#xcvrd[317]:     self.task_worker()
ERR pmon#xcvrd[317]:   File "/usr/local/lib/python3.11/dist-packages/xcvrd/sff_mgr.py", line 323, in task_worker
ERR pmon#xcvrd[317]:     if not port_change_observer.handle_port_update_event():
ERR pmon#xcvrd[317]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ERR pmon#xcvrd[317]:   File "/usr/local/lib/python3.11/dist-packages/xcvrd/xcvrd_utilities/port_event_helper.py", line 147, in handle_port_update_event
ERR pmon#xcvrd[317]:     self.logger.log_debug("$$$ {} handle_port_update_event() : op={} DB:{} Table:{} fvp {}".format(
ERR pmon#xcvrd[317]:     ^^^^^^^^^^^^^^^^^^^^^
ERR pmon#xcvrd[317]: AttributeError: 'SffLoggerForPortUpdateEvent' object has no attribute 'log_debug'

We should add a log_debug level to SffLoggerForPortUpdateEvent to fix this.

[prgeor]

@mihirpat1 I guess you are fixing this in your recent PR

[rlhui]

@prgeor , @mihirpat1 can we have a smaller PR to address this issue? thanks,