BINLOG_GROUP_COMMIT_SYNC_DELAY IS SET TO [1-9]

Problem:
=======
When binlog_group_commit_sync_delay is set to [1-9]:
1) If binlog_group_commit_sync_no_delay_count > 1, and the
number of transaction commits is less than
binlog_group_commit_sync_no_delay_count, these commits will
hang forever if no more commits come in;
2) If binlog_group_commit_sync_no_delay_count = 0, all
transaction commits will hang forever;

Analysis:
=========
Setting binlog_group_commit_sync_no_delay_count option means
that the server exits the wait procedure if the number of
sessions reaches the count given before the timeout i.e is
set in binlog_group_commit_sync_delay elapses. In order to
check if session count has reached the given limit, the
waiting time is broken into small intervals called as delta.
The delta is calculated as 1/10 of total wait time. After
each delta waiting time is elapsed queue size is checked to
see if count has reached. If count is not reached then
wait_time= wait_time - delta. This process is repeated until
wait_time > 0 and count has not been reached.

If the wait_time is set to [1-9] then the delta will become
0. If number of transaction commits is less than the count
and the delta is '0' then wait_time = wait_time - delta will
be a no-op. This will cause the commits to hang as the wait
will never end.

Fix:
===
Have '1' as the minimum delta value,
i.e max(1, wait_time * 0.1) is set as delta.
If 1 > (wait_time * 0.1) then delta=1 other wise
delta= (wait_time * 0.1).