Use NtLoadDriver and NtUnloadDriver in StartService and ControlService

[Ivan Leo Puoti]

Note that as NtLoadDriver is a stub, no program will ever
get to call NtUnloadDriver ATM.
Tests for Nt*Driver functions aren't trivial as we really need to build
a .sys driver to call them properly on windows, so the implementation,
that should follow later this week, will be tested only with safedisc 1.
Please note that this patch doesn't break anything because 
SERVICE_KERNEL_DRIVER
services currently can't and don't work at all, and even if they did 
they would unload immediately,
as they are started as a new process.

ChangeLog:
Use NtLoadDriver and NtUnloadDriver in advapi32.

Ivan.
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