test if rpmdb can talk to D-bus and SSSD processes
    
    When 'rpmdb --help' is executed in console, there is no output
    displayed because of SELinux denials. This issue should be fixed
    in SELinux policy via appropriate allow rules.
    
    When 'rpmdb --exportdb' is executed, SELinux denials appear again,
    but this time they are related to communication with SSSD and D-bus
    daemon. This issue should be fixed in SELinux policy via dontaudit
    rules because the access to D-bus and SSSD processes is not necessary
    for successful run of rpmdb.
    
    The TC covers BZ#1899548 and its duplicates.