Import svn extern from https://code.fluendo.com/flumotion/svn/flumotion/trunk/flumotion/extern/log
Remove duplicate headers

I'm not sure where these get inserted, but there are duplicates in the
SOAP output and this was the first place I found that would remove the
duplicates.
Remove copy/paste from twisted that was missing some twisted updates

This removes a spurious traceback in the log. I'm not sure if it
actually affects anything else, as the exception happens on page
getter deconstruction.