Merge the following changes from b1_4:

lfs quotachown <file system> deletes security relevant setuid bit
b=11463
r=Adilger
(Committed by tianzy)

Land kernel config changes for 2.4 kernels from b_release_1_4_8 to b1_4.
(Committed by adilger)

b=10736
Add getattr on lookup operation for NFS, so that it can properl revalidate
file attributes.
(Committed by green)

r=adilger
r=green
r=nathan