Merged revisions 79960 via svnmerge from

Merged revisions 79960 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r79960 | stefan.krah | 2010-04-11 18:49:20 +0200 (Sun, 11 Apr 2010) | 22 lines

  Merged revisions 79954 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r79954 | stefan.krah | 2010-04-11 17:15:54 +0200 (Sun, 11 Apr 2010) | 17 lines

    Fix for issues #3581, #1481 and #7650:

    1. The assumptions in check_node() were too restrictive:

         - Hardware addresses with universal_local_bit=1 are valid
           (locally administered).

         - Many of the tested functions (including uuid.getnode())
           may return valid RFC 4122 random node IDs. These are pretty
           much random 48-bit values with the multicast bit set to 1.

    2. _unixdll_getnode() calls _uuid_generate_time(), which may be None
       on some platforms. The resulting TypeError is now caught.
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