two chroot related fixes

- Pass SCR root path to stdio agents [bnc#879365](https://bugzilla.novell.com/show_bug.cgi?id=879365).
- If aborting on a SCRAgent::targetPath assertion, log it [bnc#891053](https://bugzilla.novell.com/show_bug.cgi?id=891053)

? do we really want/ need it? I worry, that it lead to a lot of configuration for various IDE(vim,netbeans, visual studio :). I prefer if you can setup emacs to work properly with C++ or given dir outside of git repo