LU-18859 quota: show default quota and root squash

LU-18859 quota: show default quota and root squash

When show default quotas don't swap ID=0 with squashed ID.
It is not required as default quotas are stored in a ROOT
lqe. Patch is against the following panic:

 (qmt_handler.c:58:qmt_get())
	ASSERTION( !is_default || id->qid_uid == 0 ) failed:
 (qmt_handler.c:58:qmt_get()) LBUG
  ...
  dump_stack+0x41/0x60
  lbug_with_loc.cold.8+0x5/0x43 [libcfs]
  qmt_get+0x185/0x3e0 [lquota]
  qmt_quotactl+0x309/0xa10 [lquota]
  mdt_quotactl+0x21f/0x880 [mdt]
  tgt_request_handle+0xc9c/0x1990 [ptlrpc]
  ptlrpc_server_handle_request+0x323/0xbd0 [ptlrpc]
  ptlrpc_main+0xb45/0x13a0 [ptlrpc]
  kthread+0x134/0x150

Cleanup lqes created in sanity-quota_87 "lfs quota -a should
print default quota setting". Without that new default quota
limits are applied to 50 default lqes created in test case 87.
It produces too many useless lustre debug logs.

Add into stack_trap restoring initial nodemap values changed
in tests 1j and 75.

Fixes: 2686838fef ("LU-18240 sec: enforce per-nodemap project quota for root")
Fixes: a4fbe7341b ("LU-14739 quota: nodemap squashed root cannot bypass quota")
Fixes: 115562106b ("LU-18453 quota: show default quota in lfs quota -a")
Signed-off-by: Sergey Cheremencev <scherementsev@ddn.com>
Change-Id: Ieef5f8b99c92d8fef3addcb7d55771c96c82129f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58563
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>