Fix typo ; Prefix all logging messages with "kdcproxy:"

[fcami]

• Fix typo (Conection)

• Prefix all logging messages with "kdcproxy:"

  When running kdcproxy in mod_wsgi, it is unclear from which
  component error messages come from. For example:

  mod_wsgi.c(): [client WARNING:root:Connection broken while writing (...)

[simo5]

Any reason why you have no simply created a new logger on the class like:
self.logger = logging.getLogger('kdcproxy') and then changeed the calls to use self.logger instead of logging directly ?

[fcami]

That would have been cleaner indeed.