Connector should honor io.enableDnsSrv client setting

SeedNodeHelper.getKvNodes calls ConnectionStringUtil.seedNodesFromConnectionString and always passes true as the `dnsSrvEnabled` argument. Should honor the client settings instead.

Can get the client setting from:

 bucket.environment().ioConfig().dnsSrvEnabled();

Alternatively, rework SeedNodeHelper.getKvNodes so it doesn't need to do a redundant lookup. (Maybe get seed node info from config provider?)