Patch (2): Implement failover on libpq connect level.

On 2015.10.14 at 13:41:51 +0300, Victor Wagner wrote:

>
> Attached patch which implements client library failover and
> loadbalancing as was described in the proposal
> <20150818041850.GA5092@wagner.pp.ru>.
>

I'm sending imporoved verison of patch. As Olexander Shulgin noted,
previous version of patch lacks support for service files.

Now support for service files is implemented and multiple host
statements in the service file are allowed.
--
                                   Victor Wagner <vitus@wagner.pp.ru>