Workaround in ll_create for BA OST hang bug - we were not setting the

Workaround in ll_create for BA OST hang bug - we were not setting the
o_uid and o_gid fields to obd_create (nor the corresponding o_valid flags)
and the BA OSTs did like that one bit, and reset themselves (hence timeout).

For now, we set the uid = gid = 0 always, to avoid issues if the file
permissions are changed on the MDS (we would not see a corresponding
permission change on the OST).  Need to revisit this when we do kerberos
security properly.