Update hostname of rcstream destination for labs

Change-Id: Ie66906b3541eb8db2dea7de2e0f94210091bf52e
Was: deployment-rcstream. Now: deployment-stream.
Remove obsoleted debug code

There's no need to iterate through $wgDBservers and set DBO_DEBUG;
$wgDebugDumpSql = true suffices for that.

Change-Id: Ifed8c581baefd42570a6e1b860beff04336daab9
Merge "Update hostname of rcstream destination for labs"
Merge "Remove obsoleted debug code"