- using TASK_INTERRUPTIBLE in OBD_SLEEP_ON at Andreas' suggestion.

- using IT_CHDIR in sys_chdir() vfs-intent_api-vanilla-2.6.10-fc3.patch. This fixes GNS with cd into mnt point.

- different fixes in GNS stuff.
- gns_enabled flag is moved to separate space instead of using LL_GNS_DISABLED
- removed error messages after inode_setattr(). Only comment is added.
- many changes in sanity-gns.sh, added checks for "cd" case. Deadlock tests are disabled for a while.