LU-13102 llog: fix processing of a wrapped catalog

LU-13102 llog: fix processing of a wrapped catalog

The logic for rereading a llog buffer had an exception
for a full catalog, when lgh_last_idx = llh_cat_idx and a first
processing index is a llh_cat_idx+1. This check is based on
a value lh_last_idx, which stays unchanged between buffer read.
But llh_cat_idx could go forward, and this lead to a wrong check
where reread doesn't happen. As a result Lustre got ENOENT for
a record and stoped osp processing.

llog_cat_set_first_idx())
catlog [0x6:0x1:0x0] first idx 34730, last_idx 34731
osp_sync_process_queues()) 1 changes, 0 in progress, 0 in flight
llog_process_thread())
stop processing plain 0x76941:1:0 index 64767 count 1
llog_process_thread())
index: 34731, lh_last_idx: 34730 synced_idx: 34730 lgh_last_idx: 34731
llog_cat_process_common()) processing log [0x2780f:0x1:0x0]:0
at index 34731 of catalog [0x6:0x1:0x0]
llog_cat_id2handle()) snx11281-OST0001-osc-MDT0001:
error opening log id [0x2780f:0x1:0x0]:0:rc = -2

The patch fixes logic and also adds/changes debugging for
llog and osp.

Cray-bug-id: LUS-8193
Signed-off-by: Alexander Boyko <c17825@cray.com>
Change-Id: I9463223a1ea904b96643b19e1580f5894142c12b
Reviewed-on: https://review.whamcloud.com/37102
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>