[check_postgres] Change to show query details for slow query time

[Greg Sabino Mullane]

> We had a need to see the client port of slow query to trace the pid of 
> the process holding the connection open. I modified check_postgres to 
> display this:-

Thanks again - I took the idea and expanded it a bit more, to include 
the username as well, and also took the opportunity to clean up the 
query_time subroutine a lot. Pushed to git if you would like to test.

-- 
Greg Sabino Mullane greg at endpoint.com
End Point Corporation
PGP Key: 0x14964AC8
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