setroubleshoot-plugin: Fix catchall plugin message for process2
    
    Sealert now recognizes new class "process2", which should be
    treated as process by this plugin.
    
    fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1507909
    
    Signed-off-by: Vit Mojzis <vmojzis@redhat.com>