LU-10794 lfs: make quota work for grace time

LU-10794 lfs: make quota work for grace time

Following commit:
LU-10011 utils: refactor lfs quota codes

Introduce a regression which will make 'lfs quota -t'
will output nothing, fix this bug and also add
a test case in sanity-quota.sh in case it is broken
in the future again.

Test-Parameters: trivial testlist=sanity-quota
Lustre-change: https://review.whamcloud.com/31606
Lustre-commit: 630cd4953daa876697f1aed4eb3819d60d0e2d17

Change-Id: I2063552505cf07464d9924f66c29fc2504bc56ce
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/31873
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>