[U-Boot] buildman error?

[Bin Meng]

Hi Simon,

With the latest buildman on the master branch, when I build x86, I got:

boards.cfg is up to date. Nothing to do.
Building 8 commits for 14 boards (14 threads, 6 jobs per thread)
Traceback (most recent call last):
  File "./tools/buildman/buildman", line 64, in <module>
    ret_code = control.DoBuildman(options, args)
  File "./tools/buildman/control.py", line 294, in DoBuildman
    options.keep_outputs, options.verbose)
  File "./tools/buildman/builder.py", line 1426, in BuildBoards
    self.ProcessResult(None)
  File "./tools/buildman/builder.py", line 423, in ProcessResult
    self._AddTimestamp()
  File "./tools/buildman/builder.py", line 320, in _AddTimestamp
    seconds = delta.total_seconds()
AttributeError: 'datetime.timedelta' object has no attribute 'total_seconds'

Can you please look at this?

Regards,
Bin