[NTOSKRNL]

[NTOSKRNL]
Short commit message: implementation of (names) tunnel cache in file system RTL.
This is in the vast majority work done by Johannes Anderwald, I've just reviewed, fixed a few things, and implemented last bits.

Thanks to Johannes for his initial implementation (and huge work!).
Dedicated to Hervé's secret plans ;-).

CORE-7272
CORE-3875

svn path=/trunk/; revision=67886