Branch b1_8

Branch b1_8
Fix group quota "too many blocks" OSS crashes.

In filter_commitrw_write():
1. lquota_chkquota();
2. obdo_from_inode();
3. lquota_pending_commit();

2. has changed uid and gid in this case, then caused
lquota_chkquota() and lquota_pending_commit() to use
different uid and gid. That is the root of the bug.
b=18793
i=yong.fan
i=panda