Renamed the SocketServer module to 'socketserver'.

Merged revisions 63132 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r63132 | alexandre.vassalotti | 2008-05-11 22:11:22 -0400 (Sun, 11 May 2008) | 4 lines

  Updated all import statements to use the new socketserver module name.
  Renamed socketserver module in its own documentation.
  Renamed documentation references.
........