xfs_quota: Enable 3 more foreign commands

xfs_quota: Enable 3 more foreign commands

Enable restore, limit, and timer.

Unsupported commands remain, for lack of kernel support, generally:
warn, quot,, enable, disable, and remove.

xfs_quota> report
User quota on /mnt/test2/git/xfsprogs/mnt (/dev/loop0)
                               Blocks
User ID          Used       Soft       Hard    Warn/Grace
---------- --------------------------------------------------
root               13          0          0     00 [--------]

xfs_quota> restore -f quotadump
xfs_quota> report
User quota on /mnt/test2/git/xfsprogs/mnt (/dev/loop0)
                               Blocks
User ID          Used       Soft       Hard    Warn/Grace
---------- --------------------------------------------------
root               13          0          0     00 [--------]
testuser            0      16384      32768     00 [--------]
fsgqa               0     102400     112640     00 [--------]

xfs_quota> limit bsoft=200m fsgqa

xfs_quota> report
User quota on /mnt/test2/git/xfsprogs/mnt (/dev/loop0)
                               Blocks
User ID          Used       Soft       Hard    Warn/Grace
---------- --------------------------------------------------
root               13          0          0     00 [--------]
testuser            0      16384      32768     00 [--------]
fsgqa               0     204800     112640     00 [--------]

xfs_quota> state -u
User quota state on /mnt/test2/git/xfsprogs/mnt (/dev/loop0)
  Accounting: ON
  Enforcement: ON
  Inode: #12 (16 blocks, 1 extents)
Blocks grace time: [7 days]
Inodes grace time: [7 days]

xfs_quota> timer -b 3days
xfs_quota> state -u
User quota state on /mnt/test2/git/xfsprogs/mnt (/dev/loop0)
  Accounting: ON
  Enforcement: ON
  Inode: #12 (16 blocks, 1 extents)
Blocks grace time: [3 days]
Inodes grace time: [7 days]
Realtime Blocks grace time: [--------]

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com
Signed-off-by: Dave Chinner <david@fromorbit.com>