Fix some exception handling in catalyst_support.py

Fix some exception handling in catalyst_support.py
remove intermediate destination folder of iso and tarball
Add additional tests for folders not found on host but defined
        in spec file.  Keep catalyst from erroring in this case.
Change exit code on shell scripts so that errors are reported to catalyst
        and causes catalyst to die on errors
Fix bug in livecd-stage1-chroot.sh so that it uses USE flags properly
Added additional check for mkisofs.  Informs user of where to get the program.
Removed autoresume code from ccache and distcc installation until I can figure
        out a way to have the autoresume flag go someplace outside the chroot.

git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/catalyst/trunk@628 d1e1f19c-881f-0410-ab34-b69fee027534