Update the install-uninstall-dsp-packages test
    
    Particular changes:
    - install also DSP packages which do not distribute its custom SELinux
      module in a subpackage with the "-selinux" suffix (Fedora only)
    - use rlLogWarning to display warnings
    - list /var/run entries not having an equivalent rule in /run
    - make use of the DEBUG variable to keep output files
      with various data after the test finishes:
    -- list files in /run which have incorrect context
    -- list installed packages
    -- list SELinux modules, permissive and unconfined domains
    -- check if dbus communication is defined bidirectionally