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)