test if tlp can search /var/lib/snapd/
    
    A lot of reported BZs revealed that SELinux prevents the tlp processes
    from searching (syscall = newfstatat) under the /var/lib/snapd directory
    when the snapd package is installed. The TC reproduces the situation.
    
    Based on the last comment in BZ#1888699, I believe that SELinux policy
    should dontaudit the access. The TC looks for appropriate policy rules.
    
    The TC covers BZ#2221019 and its duplicates.