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CP-29955: Log failures in key lookup plugins

- Previously we did not log anything in the plugin manager when key
  lookup plugins were invoked or when they failed with an exception.  So
  now I have added debug logs to the plugin manager that are written to
  SMlog.
- Fixed how modules in the plugins directory are loaded. To avoid
  loading itself, the plugin manager compared each filename in its
  directory to the __file__ variable. However, sometimes this variable
  was __init__.pyc, not __init__.py, so the comparison returned false,
  and the key manager loaded itself recursively, which in turn tried to
  load the plugins again, but failed.
- I've also removed some pylint warnings: I've converted the Logger
  class into a function, fixed indentation, and removed trailing
  whitespace.

Signed-off-by: Gabor Igloi <gabor.igloi@citrix.com>

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