volume-usage-audit utlis logs unecessary message at for deleted
volumes or exception:
try:
LOG.debug('Send notification for vol X')
_notify_func
except Exception:
LOG.exception(...)
In the case when _notify_func raises exception, it logs
'Send notification' and the exception.
This change reduce logs by only logging 'Sent notification' when
there is no exception by:
try:
_notify_func
LOG.debug('Sent notification for vol X')
except Exception:
LOG.exception(...)
Also, this change fixes notify_snapshot_usage() for not handling
the case when source volume for the snapshot is deleted.
Closes-bug: #1631561
Change-Id: Iff5448e888ee39bce1ff99c7bf48581d655fb687
f4f42c966e