Ian Barwick 5cbaff8d0a Improve database connection failure logging ...

Log the output of PQerrorStatus() in a couple of places where it was missing.

Additionally, always log the output of PQerrorStatus() starting with a blank
line, otherwise the first line looks like it was emitted by repmgr, and
it's harder to scan the error message.

Before:

    [2019-03-20 11:24:15] [DETAIL] could not connect to server: Connection refused
            Is the server running on host "localhost" (::1) and accepting
            TCP/IP connections on port 5501?
    could not connect to server: Connection refused
            Is the server running on host "localhost" (127.0.0.1) and accepting
            TCP/IP connections on port 5501?

After:

    [2019-03-20 11:27:21] [DETAIL]
    could not connect to server: Connection refused
            Is the server running on host "localhost" (::1) and accepting
            TCP/IP connections on port 5501?
    could not connect to server: Connection refused
            Is the server running on host "localhost" (127.0.0.1) and accepting
            TCP/IP connections on port 5501?

2019-03-20 12:13:40 +09:00

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