LU-14631 quota: fix qunit sort

Fix lqes_cmp that is used to sort lqes by qunit. As lqes_cmp returns
integer, it returns incorrects values if difference between qunits is
grater than 4GB causing write to hang instead of fail with -EDQUOT:

[<ffffffffc0701945>] cl_sync_io_wait+0x295/0x3c0 [obdclass]
[<ffffffffc07026f8>] cl_io_submit_sync+0x1c8/0x360 [obdclass]
[<ffffffffc128dc0a>] vvp_io_commit_sync+0x12a/0x460 [lustre]
[<ffffffffc128f5ee>] vvp_io_write_commit+0x4de/0x620 [lustre]
[<ffffffffc128fa39>] vvp_io_write_start+0x309/0x990 [lustre]
[<ffffffffc0700a18>] cl_io_start+0x68/0x130 [obdclass]
[<ffffffffc0702e8c>] cl_io_loop+0xcc/0x1c0 [obdclass]
[<ffffffffc1243514>] ll_file_io_generic+0x5c4/0xdc0 [lustre]
[<ffffffffc12441b9>] ll_file_aio_write+0x289/0x730 [lustre]
[<ffffffffc1244760>] ll_file_write+0x100/0x1c0 [lustre]
[<ffffffffa0241320>] vfs_write+0xc0/0x1f0
[<ffffffffa024213f>] SyS_write+0x7f/0xf0

The issue is occurred if a user hits block hard limit in a pool (pools
limit 6GB), while global limit is set to some huge value(53T in my case)

Change global limit in sanity-quota_1e to check that system doesn't
hung anymore.

HPE-bug-id: LUS-9891
Change-Id: I5a16fd3a40172187bbf35d9a9c9bfeef2ef3a108
Signed-off-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Tested-by: Jenkins Build User <nssreleng@cray.com>
Reviewed-by: Alexander Boyko <c17825@cray.com>
Reviewed-on: https://review.whamcloud.com/43410
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>