DRSUAPI torture tests refactoring - work in progress

[Kamen Mazdrashki]

Hi Andrew,

Please find attached few patches for RPC-DRSUAPI test case.
Added value in those patches is that test case still fails,
but now fails gracefully while printing the exact location 
of failure. 
Test case is also refactored to be more compact and readable
(whenever possible).

RPC-DRSUAPI test status is as follows:
- it seems it passes 'make test TESTS=drsuapi' - attached is log
  file and summary file. I can't quite understand what is going on
  under the hood and what exactly is tested. However, I think 
  it should fail against samba (as the test case fails against Win).
  Perhaps it is the 'rpc.drsuapi.*' line in selftest/knowfail file
  that makes the test to be displayed as success.
- W2K3-R2 -> test case still fails. I am on figuring out why and
  trying to fix it.
- W2K8-R2 -> test case can't be executed as torture_join_domain()
  function fails.

CU,
Kamen
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