Ian Barwick f982708b35 Add function test_db_connection() ...

The difference between this and establish_db_connection() is that
it outputs any connection failure as a [NOTICE] rather than an
[ERROR]; it's intended for use in e.g. polling a server to wait
for it to come up/go down, while preventing [ERROR] log lines
which may cause confusion.

2016-01-20 07:56:03 +09:00

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