[pgpool-hackers: 3651] Fix miscount connection_count

[Takuma Hoshiai]

Hello,

I found that pgpool miscount connection count, when pg_terminate_backend()
is executed for a session which is running query.

We can confirm this bug by regression test 073 with log_min_messages = 'debug5'.
I have attached the patch. Please check that this patch is correct, because
I don't know the detail of connection count algorithm.

Best Regards,

-- 
Takuma Hoshiai <hoshiai at sraoss.co.jp>
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