test if plymouthd can access /dev/kmsg
    
    Recent testing revealed that SELinux prevents the plymouthd processes
    from accessing the /dev/kmsg device. The TC reproduces the situation.
    
    In order to support the expected plymouthd functionality, I believe
    that SELinux policy should allow the access. The TC looks for
    appropriate policy rules and file context patterns.
    
    The TC covers BZ#2256442.