Increase exception log details

Add informative message to log, as the exception is logged by default

Replaces:
except Exception as exc:
    LOG.exception(exc)

With:
except Exception:
    LOG.exception("[Description of the failed operation]")

Closes-bug: #1262547

Change-Id: I97cd13e4b32df9a3f9b2e7e1f8946a6a4e0aed3f
7 files changed