Identify conflicts during installation of dsp packages
    
    Add testcode to selinux-policy/install-uninstall-dsp-packages test suite
    to discover conflicts during third-party or dsp selinux package
    installations. The code installs-uninstalls relevant packages collected
    from all the available repos and checks for failures / AVC errors.
    
    Signed-off-by: Amith Kumar <apeetham@redhat.com>