linux-system-roles use "tests" as a test keyword
    
    Since commit a456db2c59e43b331184ceda5a1bd5d51ddd2d2d ("Move tests to /tests
    directory and rename to new naming scheme") linux-system-roles selinux tests use
    tests/ directory and renamed test playbooks to tests_*.yml.
    
    Fixes:
    [   FAIL   ] :: Command 'cd selinux/test' (Expected 0, got 1)