LU-6722 ldiskfs: declare credits for quota when destroy inode

LU-6722 ldiskfs: declare credits for quota when destroy inode

When destroy the inode, if it has large EA that occupies another
separated block, then it calls ldiskfs_xattr_delete_inode(). But
such function does not consider the quota modification as to that
before making the group descriptor dirty, the persevered credits
becomes zero, so jbd2_journal_dirty_metadata() failed as "-ENOSPC",
then the subsequent journal abort makes the system as RDONLY.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I0567d6b6d54cd57b25524c3d58190926e3505867
Reviewed-on: http://review.whamcloud.com/15334
Tested-by: Jenkins
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>