MGM: open: do ViewLocks for Scheduler and FS lookup accesses
- Some unprotected accesses from !141 (merged) are now under smaller view locks. There is almost a whole view lock towards the end where we do the various redirect/placements
- replica tracker is now under a ns_wr_lock
- some of the locks are renamed to be more descriptive matching their roles
Signed-off-by: Abhishek Lekshmanan abhishek.lekshmanan@cern.ch