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Since we added a new, required parameter to OpCreateInstance, we need to
update burnin to build the correct opcode.

Reviewed-by: schreiberal

Change this to have the exact same parameters as OpQueryInstances.

Also fix burnin which is broken since r146.

Reviewed-by: imsnah

This changes the raising of exceptions from:
  raise Exception, value
to
  raise Exception(value)

as the first form will be removed in python-3000 and the second form is
preferred now.

The changes also involve a few cases of changing from raising standard
exceptions and use our own ones.

The new version also fixes many pylint-generated warnings, especially in
ganeti-noded where I changed many methods to @staticmethod.

There is no functionality changed (barring any bugs).

Also improve the burnin by doing an optional replace-disks.