[NTOSKRNL]

[NTOSKRNL]
- Add a stub for IRP_MN_REMOVE_DEVICE in PnpRoot
- Revert 2 incorrect changes from r46983 (DNF_ENUMERATED added to the DNF_ADDED assertion and setting the DNF_RESOURCE_REPORTED flag in IopStartDevice2)
- Set the DNF_LEGACY_DRIVER flag if the AddDevice handler is missing
- Add a helper function called IopSendRemoveDevice which sends IRP_MN_REMOVE_DEVICE to a device object
- Call IopSendRemoveDevice if IRP_MN_START_DEVICE fails
- Set the DNF_STARTED and DNF_ADDED flags for legacy drivers
- Enable the DNF_ADDED assertion in IopStartDevice2

svn path=/trunk/; revision=46997