A mostly-fix for "mknod /mnt/lustre/foofo p". It doesn't fail outright

A mostly-fix for "mknod /mnt/lustre/foofo p".  It doesn't fail outright
anymore (S_IFREG only for regular files), it doesn't oops (pass in
dentry->d_it to ll_create), it only complains "file already exists" after
it has already created the file.  Definitely an intent thing, but it is
too late to fix that part.

Also includes the LOV changes from today, as they don't seem to harm
the current setup (runtests finishes).